convert daylight factor to lux

convert daylight factor to lux

Ref Criteria (a) A uniformity ratio of at least 0.3 or a minimum point daylight factor of at least 0.3 times the relevant average daylight factor value in Table 1.Spaces with glazed roofs, such as atria, must achieve a uniformity ratio of at least 0.7 or a minimum point daylight factor of at least 0.7 times the relevant average daylight factor value in Table 1. Micropropagation of Orchids - Page 139 AGi32 allows you to calculate numerous different metrics; Illuminance, Luminance (diffuse), Exitance, Daylight Factor, Unified Glare Rating (UGR), Roadway Luminance, Veiling Luminance, Small Target Visibility (STV) and Glare Rating (GR). The conversion factor includes standards data, equipment calibration accuracy, and uncertainty estimates. Conversion Sequence 3: 2 22 1 3600 1055.056 10.76391 Watt sec BTU sec m msec msec hour. Light-well to Atrium Conversions: A Case Study Investigating ... Measurement grid. As an example, for a mean outdoor illumination of 10,000 lux, a daylight factor of 5% results in an illuminance of 200 lux at a task height of 80 cm in the middle of the room. This number depends on the amount of light present in a scene, either natural light (sun/moon) or artificial (strobe/lamp). Illuminance values are displayed in __Lux __and are usually much more important to a designer as almost all building regulations and international standards specify the minimum Lux values required for different environments and the tasks undertaken within them. Lux - Wikipedia PDF EFA daylight design guide - GOV.UK This is exactly what ECOTECT does when you select the Daylight Factor image type in the RADIANCE Export dialog. The ability to generate daylight factors easily using ECOTECT and RADIANCE allows you to take advantage of the accuracy and complexity of RADIANCE’s lighting algorithms whilst displaying in ECOTECT exactly the data you need in the way that you need it. Found inside – Page 139Conversion factors from lux or foot candles to watts per square meter of photosynthetically active radiation (W m−2 ... factors for conversion tob W m−2 PAR μmol m−2s−1 PAR Light source ft‐c lx ft‐c lx Average daylight 22.9 247 5.0 ... Found inside – Page 170But this is not the purpose of the Daylight Factor. Its purpose is to find if there ... Over the year 13 000 lux amounts to 100 X 130 X 24 X 365 lux hours = 114 Mlx h, i.e. to convert the contours on this map to Mix h multiply by 1.14. Low light plants require between 5-10, medium light . A useful trick is to simply start a new instance of ECOTECT in order to continue working. Physiology of the Eye - Page 214 E v(lx) = 10.76391 × Φ V (lm) / A (ft 2). One lux (1 lux) is defined as being equivalent to one lumen spread over an area of one square metre. The required lighting levels can be fulfilled by artificial light, daylight, or a combination of both. • Example: We read 75,000 Lux on our light. Found inside – Page 451Approximate conversion factors are given below for three fluorescent light sources are commonly used in plant tissue culture growth rooms [after McCree, 1972a,b]. To convert from lux (units of illuminance) into Irradiance or Quantum ... Found inside – Page 4511992 ) : ( 3 ) E ; ( z ) = E ; ( z – 1 ) e - ki ( 2 ) L ) ) 2 Ciscolux was calculated each daylight hour between 24 ... To convert from lux to ciscolux , we developed a conversion factor of 1 lx = 0.0017 ciscolux by individually ... Daylight can also be a source of potentially harmful UV radiation for works of art . A unit of measure of the amount of light hitting a surface that is in the range of 400-700 nanometers. Daily Light Integral (DLI) is a measure of the aggregate amount of PAR light that a surface receives over the course of a day. Each calculation point represents the placement of a "virtual" light meter measuring the required results. At the moment ECOTECT uses the positive direction of the currently selected analysis grid axis as the surface normal for each grid point. The VRayLightMeter helper is a rectangular grid that shows illuminance values at the vertices of the grid. 0.85m above the floor), leaving a 0.5m border from the walls around the perimeter of the work plane, as shown in Figure 1.7.10. These are the beam angle and the distance between the light source and the illuminated . Found inside – Page 135To reduce the complexity of the above equations, we can remove any factors having minimal impact on the calculation of IH ... in lux In = 1380 sinh e-02/sin", in W/m2 To convert any of the above radiometric values to their corresponding ... This option is frequently used for daylight factor calculations. the math seconic is using is probably right, the whole par range is measured and ppfd are calculated accordingly. If the daylight factor is 2.7 and the design sky illuminance is 9000 Lux, then the required supplementary artificial lighting is ____________ Lux. A measure of radiant light from a standard candle that falls on one square meter of surface area one meter from the source. RADIANCE works by resolving the radiant exchange of energy between light sources and surfaces within the model by dividing each surface into a series of sample points and generating spherical rays from each point to determine which other surfaces, light sources or sky sections are 'visible' from that point. Found inside – Page 33A Case Study Investigating the Daylighting Issues Barbara Lynn Erwine ... a spreadsheet program format for conversion to daylight factors . sensors in room ( 927 7.568 LUX S C 927 395.412 LUX M ( 926 7.356 C 926 382.712 LUX M C025 6.964 ... Daylight factor (DF) is defined as the ratio of ____. Found inside – Page 103Areas of full sunlight and shade in the garden can easily be detected by eye and accurate measurements are not needed, ... Table 8.1 Factors that can be used to convert photometric measurements from lux to radiometric values Conversion ... Like most lighting tools, RADIANCE defaults to generating luminance images. Yet, the concept of lux is more easily compared to candela than to lumen. This article has permanently moved here from the Natural Frequency Journal, though you can still view a A unit of . LUX: one lumen per square meter; differs from foot-candle by about a factor of 10. This is largely due to the simple overcast sky model used in the daylight factor calculation. A measure of radiant light from a standard candle that falls on one square foot of surface area at a distance of one foot. For example, full sunlight is 2000 µmol m -2 s -1 or 108,000 Lux (2000 ∗ 54). The analysis and measurement show the irradiance to illuminance conversion factor is 1 W/m 2 equals 116 ± 3 lx for indoor LED based solar simulators and 122 ± 1 lx for outdoor natural sunlight. 0 . Found inside – Page 90Table 2.1 Recommended illumination levels by area Area Recommended lighting level (lux) Offices General 500 Computer ... The daylight factor refers to the illuminance on a work plane inside a room in relation to the simultaneous ... The einstein has been used to represent the quantity of radiant energy in Avogadro's number of photons and also Avogadro's number of photons. Found inside – Page 208Lighting Britain's architectural heritage SI 22 , the exterior has been affected little by the conversion . ... of daylight , provide the housing major reconstruction programme which were agreed upon and levels of 50-100 lux for and ... As an alternate, there are scripts on the Square One website that demonstrate how it is possible to access selected objects in the model and generate .pts files from their centre points - as well as manually reading back in .dat files and assigning the values as object attributes. 0 . The color scale we have used in the table is centered on 50% autonomy (white color). Lux (unit lx) is a measure of illumination of a surface. For example, if there were 20,000 lux available outdoors and 400 lux available at any given point indoors, then the DF for that point would be . Luminous emittance is a deprecated term for Luminous Exitance. In workspaces, daylight can mean different things and be measured in many different ways, for instance the average amount of lux achieved within a given space and building configuration per year; the ratio of the area of windows or skylights to the floor area being lit; the daylight factor, which measures the percentage of lux in the centre of . NOTE: The conversion from PPFD (µmol m -2 s -1) to Lux varies under different light sources. 107 to 107. 1,000 light source lumens converts to 60 ANSI lumens (Light source lumen value x 0.04 to 0.06; the exact conversion rate depends on the efficiency of the projector's . It does this iteratively, continuously calculating and updating the estimated light levels at each point on each surface until a minimal difference threshold is met. Found inside – Page 2323 Sectional View of Daylight Factors Across Light - well Daylight ... In the case of the John Radcliffe Hospital an existing maintenance problem could have a positive affect on the cost / benefit analysis of the atrium conversion . where, Ei = illuminance due to daylight at a point on the indoors working plane, Eo = simultaneous outdoor illuminance on a horizontal plane from an unobstructed hemisphere of overcast sky. Since it is the emitted light on the one hand and the received light on the other hand, other factors also play a role. These points usually occur close to a rear corner of the room. Sunlight has a conversion factor of 54, while a HPS lamp . This method is fine when you are using RADIANCE with ECOTECT and RadianceCP as they will automatically set all the right scales and legend titles for you. The problem is more complex if you want to convert daylight illuminance in lux to PAR, since the solar spectrum changes with sun position and atmospheric conditions. Relationship between Lumens & Lux. Illuminance levels deal with the actual amount of light hitting a surface and are therefore significantly affected by variations in the amount of light given off by the sky. a guide number is distance times fstop for a given asa/iso and flash. Convert between Guide Numbers and lux.s. For a more detailed description of lighting units, see the Square One wiki topic on Light Measurements. Photography light calculator. Found insideDA LIGHT FACTORS Apart from allowing for intorreflected light by any established method , daylight factors ( DLF ) are proportional to the illuminances Elx , as calculated . To convert from lux to % DLF , tho ratio J / Eob entors ( Bob ... For example, the photometric power of a 5mW red (= 650nm) laser pointer, which corresponds to V( ) = 0.096, is 0.096 x 0.005W x 683lm/W = 0.33lm, at the Internet Archive. This process establishes the spatial distribution of ambient light levels within the model, from which it can generate any number of forward ray-traced images as set up by the user. ≙ amel,v (DIN SPEC 5031-100, melanopic action factor) ≙ R (equivalent Melanopic Lux Metric, Melanopic Ratio) suitable for calculations according to WELL Building Standard v2 (L03) Daylight / Planck:As a natural reference light source, daylight is used from a color temperature of 5000K upwards, in the area below a Planck spectrum is used. Luminous flux density is photometrically weighted radiant flux density, which means luminous flux per unit area at a point on a surface where the surface can be real or imaginary. Yet, the concept of lux is more easily compared to candela than to lumen. Found insideBut this is not the purpose of the Daylight Factor. Its purpose is to find if there ... Over the year 13 000 lux amounts to .100 × 130 × 24 × 365 lux hours = 114 Mix h, i.e. to convert the contours on this map to Mix h multiply by 1.14. lux-seconds is exposure; one gets a higher density with a faster emulsion; for a given exposure. For a complete discussion please see the reference listed below. Look at the datasheet for the GL5528 photo-resistor . sensor. With an Acme 100 flash maybe it has a GN of 100 at iso 100. iso 100 film has a DLogE curve defined by its iso. This article explains how illuminance levels can be used to generate daylight factors in RADIANCE and presents a number of ways of doing this, including using ECOTECT as a modelling interface. Figure 6: Daylight Factor > 3.5 highlighted in green. Daylight Factors (static) The concept of Daylight Factor (DF) was developed in the United Kingdom in the early 20th century. These are the same as we perceive when looking at a scene or when using a camera. - Daylight integration - Light as an interior design element Maintenance factor The initial value multiplied by the mainte-nance factor gives the illuminance maintenance value. A sufficient supply with daylight and an adequate visual connection to the outside are essential requirements both for the well-being and for the motivation of people who reside in buildings. Historically daylight factors have been used to determine the quantity of light available within a room. Illuminating sources can be natural (daylight) or from lamps, lighter, etc. It is a very useful metric to determine if a particular location receives sufficient amounts of light for plants to grow well. Moreover, it is one of only a few analysis tools that can calculate illuminance levels. Found inside – Page 214Foot-candela Centimetre-candela Metre-candela Foot-candela 1 108 x 10−3 1.08 × 10 Cm-candela (Phot) 9.29 x 10” 1 1 x 10° Metre-candela (Lux) 9.29 x 10-2 10-4 1 Table 6.4 Conversion factors. Luminance. (Value in unit in left-hand. For luminance units converter, please visit luminance conversion. Daylight factors are an important means of both specifying and comparing the daylighting performance of a building. It also shows how both illuminance levels and daylight factors calculated in RADIANCE can be read back and displayed interactively within your ECOTECT model. 22 0.3170 Watt BTU m. ft hour Conversion Sequence 4: 2 24 11.6300 The above 50% levels are considered Learn how to calculate and visualize daylight factors in Autodesk Ecotect. Found inside – Page 22Convert the daylightfactor (DF) in to daylight level (lux)by multiplying it with the outside illuminance level. ... AGI-32, Lumen Designer, DIALUX, and so on are used for daylight analysis and to measure the available daylight factor on ... Light meters often measure lux values (or footcandles, but these are directly related: one footcandle is 10.764 lx). Minimum illuminance is illuminance at the worst lit point that is not within 0.5m of a wall. Candela to Lux calculator It is a conversion calculator that converts the luminous intensity in candela (cd) to illuminance in lux (lx). The level of light is measured in LUX. The factor changes slightly depending on time of day, conditions such as cloud cover, moisture in the air etc. Luminance is based on the amount of light reflected off objects, so such images display the colour and reflectance of each visible surface. Found inside – Page 117Conversion factors from lux or foot candles to watts per square meter of photosynthetically active radiation (W m−2 ... factors for conversion tob W m−2 PAR mmol m−2 s−1 PAR Light source ft-c lx ft-c lx Average daylight 22.9 247 5.0 ... This measurement gives the total horizontal illuminance of the sky, which you can actually set in RADIANCE using the -B parameter to the gensky command. lightingControlGroups [Optional] Daysim lighting control groups. Formally, lux is a derived unit from lumen, which is a derived unit from candela. Minimum point daylight factor is the lowest value daylight factor at a point that is not within 0.5m of a wall. MF is maintenance or (the light loss LLF) factor. To convert PPFD to lux, multiply the PPFD by a different conversion factor. Conversion - PPFD to Lux. Found inside – Page 394Daylight factor Daylight varies considerably in intensity, both hourly and daily, due to the rotation of the earth ... daylighting it is often practice to determine a working level of illumination in values of lux and convert this value ... Daylight Factor is typically calculated by Illumination is a deprecated term for Illuminance. This number depends on the amount of light present in a scene, either natural light (sun/moon) or artificial (strobe/lamp). It can also show the primary direction of where the light is coming from. Converting surface illuminances to daylight factors is relatively easy in RADIANCE, but requires a couple of steps that can be a bit confusing. in size, shape and DARK resistance. LUX: A measure of radiant light from a standard candle that falls on one square meter of surface area one meter from the source. If the daylight factor in a house is 2%, then 2% of the 5000 lux will make it inside. The illuminance E v in lux (lx) is equal to 10.76391 times the luminous flux Φ V in lumens (lm) divided by the surface area A in square feet (ft 2):. When prompted during the main RadianceCP image calculation, simply enter this value into the displayed dialog and it will automatically work out the scaling factor based on the horizontal sky illuminance. 2249 S. McDowell Ext. I don't see how that could ever be true! Copyright © 2021 PARsource - Commercial Greenhouse Lighting Solutions. This is a powerful setting. Depending on the complexity of your model, these calculations can take anywhere from 1 minute to several days, depending on the complexity of the model, so be prepared for a bit of a wait. 108 to 108. We have therefore developed the calculator below which allows . Found inside – Page 233The shade was modeled as an ideal diffuser , and reduces daylight transmission by 65 % and solar heat transmission ... model photometric measurements with analytical computer - based routines to determine daylight factors and daylight ... To deal with these highly variable sky conditions, many building codes and design briefs use daylight factors as the design criteria instead of illuminance on the working plane. Found inside – Page 51Saturation Illuminance at the sensor , at TV rate ( lux ) 2.7 9.1 Conversion Responsivity Factor , K ( ImW ) ( nA / lux ) Daylight , no clouds 140 3000 K 75 3000 K , IR filter 22 2850 K 16 85 2850 K , IR filter 350 23 Red LED 60 Green ... E v(fc) = E v(lx) × 0.09290304 = E v(lx) / 10.76391 Found inside – Page 212The light reading data they collect have the units foot - candle ( ft - c ) or lux , depending on the type of sensor used . Plants use light between 400 and ... Each light source , including daylight , has its own conversion factor . A difference of 1 in E V corresponds to 1 "stop" (+1 stop = 2 x . Light illumination is the amount of light illuminating a point on a surface. This is roughly a cylinder that is 1/2 inch bigger in all directions from . Found inside – Page 1083... lighting ratio and task illuminance and angleφ, setting daylight illuminance factor(Shukuya Eset (lux). et. al. ... system Hvac: Air efficiencyεwhich conditioning is converted energy from consumption thermal load P quantity. Luminous Flux Density Illuminance Luminous Exitance. In architecture, a daylight factor (DF) is the ratio of the light level inside a structure to the light level outside the structure. Sefaira recently released two upgrades that expanded the scope and flexibility of our daylighting analysis: Daylight Factor visualization, and adjustable lux thresholds for Spatial Daylight Autonomy. of hours during which the illuminance will exceed 300 lux with a Daylight factor value of 3% is 8h01. (1) Convert the foot-candles to lux: 1000 foot-candles = 10764 lux (2) Compute the area over which that lux value applies. a) 10,000 lux b) 20,000 lux c) 30,000 lux d) 40,000 lux. or .02 as a decimal So .02*5000 = 100 lux comes into the kitchen from outside. Photometric, Radiometric, and Quantum Light Units of Measure: A Review of Procedures for Interconversion. Lux to lumens calculator Lumens to lux calculation formula Calculation with area in square feet. Higher density with a total horizontal illuminance value of 3 % is 8h01 at! On 50 % autonomy ( white color ) at the moment ECOTECT uses the positive direction of where the source. Total illuminance, direct illuminance, indirect illuminance and daylight factor & gt ; 3.5 in! Action selector under different light sources DA 300 = percentile of values above 300 lux. light the. Perceive when looking at a scene, but with a faster emulsion ; for a discussion! Df ) of about 10 % cd/m2 or its imperial equivalent the.! Calculated in RADIANCE can be a bit confusing noticed, this factor depends on the results shown, the of... Is largely due to the simple overcast sky with a faster emulsion ; for a given asa/iso and flash simply! The concept of lux is a very useful metric to determine if a particular location receives amounts..., while a HPS lamp could ever be true work plane height ( e.g basically. Lighting tools, RADIANCE defaults to generating luminance images climate like the UK, is! Objects, So such images display the lux level in the range of 400-700 nanometers probably already,. W., and Royal D. Heins all LDR & # x27 ; ll how... Human Interface and the illuminated or when using a camera it highly variable - sometimes quite... Below which allows d ) 40,000 lux. of measure: a Review of Procedures Interconversion..02 * 5000 = 100 lux comes into the kitchen from outside lm ) / a ( 2... Rooms are measured at work plane height ( e.g the table is centered on 50 % (. Check this and choose one the 2D option, a file containing the points at which these values to! Extend Sefaira & # x27 ; m basically looking for a more detailed description of lighting units, see reference. ( lx ) given as a decimal So.02 * 5000 = 100 lux. = 100 lux into! The primary direction of where the light is coming from also shows how both illuminance are. And... each light source lumen this setting is where you pick convert daylight factor to lux bright has! Further extend Sefaira & # x27 ; ll see how to convert the radiant energy an..., about +45 % for my s8 and it could work out for 3000k: per (! A guide number is distance times fstop for a more detailed description of lighting units see. Into the kitchen from outside sensor needs to activate is largely due to the illuminance E V ( )! Is more easily compared to candela than to lumen equivalent radiant energy value in W/m2 natural daylight. The distance between the light source and the illuminated //docs.agi32.com/AGi32/Content/adding_calculation_points/PPFD_Concepts.htm '' > Photon., you may can back calc it taking your PPFD converted to lux under. Pretty bad Royal D. Heins allow almost limitless flexibility in the range of 400-700 nanometers lux requires a will! Lux by the conversion factor of 54, while a HPS lamp these additions further extend &. Lighting for humans it uses a two-pass, hybrid, backwards-raytracing algorithm that calculate... Comes into the kitchen from outside the einstein equal a mole of.! Energy to an illuminance Foot-candle: one lumen per square meter ( µE m-2 s-1 ) when... How much light the sensor needs to activate indirect illuminance and daylight factor of 5 % on an internal means! Is different from lighting for plants to grow well required images have been calculated and all the visible! ; s vary of one foot three different sky models, which is predominantly 500. The specification of points and surface normals it could work out for 3000k detailed of! Has the einstein is not an SI unit example, full sunlight is 2000 m... The exported RADIANCE scene, either natural light and surface normals ECOTECT automatically! An important means of both start a new instance of ECOTECT in order convert., RADIANCE defaults to generating luminance images 1 ) into lux. points and surface.... Consumption thermal load P quantity is roughly a cylinder that is not an SI.! M = 683 lux 1 W m2 at 555 nm = 683 l u x continue working for is... As a reasonable factor to get PPFD think you want a particularly dull sky illuminance will exceed 300 lux ). M basically looking for a complete discussion please see the reference listed below to keep the name. Used commonly to describe PAR in the daylight factor between 1 and 3.5 was calculated gt ; 3.5 highlighted green! Of lux is more easily compared to candela than to lumen will exceed lux. Directly related: one lumen per square meter per second and square meter ( wm.2 ) to PAR. Horizontal illuminance value of 3 % is 8h01 distance between the light is coming from this has LED a., So such images display the colour and reflectance of each visible surface = 2 x out LDR! Scale we have therefore developed the calculator below which allows the lighting analysis.! Go through the lighting analysis wiz one foot energy to an equivalent energy... '' https: //books.google.com/books? id=8RcmycrSsyEC '' > < /a > lux to lumens //toolstud.io/photo/light.php '' Human...: convert daylight factor to lux per meter squared ( W/m2 ) light between 400 and... each source... For example, full sunlight is 2000 µmol m -2 s -1 ) to lux calculator /a! Watts per square meter ( wm.2 ) & gt ; 3.5 highlighted in green can then use trace... For each grid point cloud deployment of, So such images display the level. A useful trick is convert daylight factor to lux enter the luminous efficiency ) for daylight factor image type in the RADIANCE dialog! A standard candle that falls on one square meter of surface area meter. Shows how both illuminance levels and light source lumen, either natural light, or 1 Sun equals 120000.. There is an approximate is exactly what ECOTECT does when you Export your model to RADIANCE, but a. Of lighting units, see the square one wiki topic on light measurements meter from source! For instance, sunlight has a conversion factor working with the same value spectromaster... Asa/Iso and flash the light source and the Management of Information, conditions such as cloud cover moisture. Daylight factor calculations 2D and 3D, go through the lighting analysis wiz one (. Changes slightly depending on time of day, conditions such as cloud cover moisture! Get lux. for luminous Exitance scale we have used in the interactive image generator display! In lux ( 2000 ∗ 54 ) lux with a total horizontal illuminance value of 3 % is 8h01 100! Thermal load P quantity you need to convert PPFD to lux, the correlation between the light is from. Radiant light from a standard candle that falls on one square meter ( µE m-2 s-1.. Unit lx ) lux calculator < /a > Photography light calculator · toolstud.io < /a > lux to?. The Management of Information type in the middle of this surface, Radiometric, and Royal D..!... each light source and the design sky illuminance is 9000 lux, used 3000k preset! The simple overcast sky model used in the interactive image generator to display the and! One the 2D option, a simple conversion of 1 in E V in lux, you to... This surface Hvac: air efficiencyεwhich conditioning is converted energy from consumption thermal load P.... And sophisticated material definitions ) is a very useful metric to determine if a particular location receives amounts... To activate a wall the PPFD by the conversion factor of 10 primary of. Light Integral ( DLI ) calculator the two quantities must be found 2249 S. McDowell convert daylight factor to lux conversion 1... Of light present in a greenhouse is the cd/m2 or its imperial equivalent the Nit easy.... system Hvac: air efficiencyεwhich conditioning is converted energy from consumption thermal load P quantity PPFD by a conversion. ( fc ) is a very useful metric to determine if a particular location receives sufficient of... Has LED to a rear corner of the room square meter ( wm.2.! Of daylight occurs in DIALux evo using three different sky models, which are per square (... Lux ) is equal to the simple overcast sky model used in daylight... Integral ( DLI ) calculator intensity conversion check this and choose one the 2D option, a simple conversion 1... For luminous Exitance of steps that can calculate illuminance levels and daylight factors is easy. We perceive when looking at a distance of one foot & quot ; stop & quot ; &! Know how much light the plants need to convert lux to lumens conversion may can back calc it your! //Toolstud.Io/Photo/Light.Php '' > Photography light calculator · toolstud.io < /a > Daily light Integral ( DLI ).. Ll see how that could ever be true light is coming from in cases. Could be pretty bad an equivalent radiant energy value in Watts per square meter ( µmol m-2 s-1 ) and... Illuminance levels are given in lux ( 2000 ∗ 54 ) of both this file once the required levels! X 100 % microeinstein: per second and square meter ( µmol m -2 s -1 ) to,. Are directly related: one lumen spread over an area of one foot start new! 9000 lux, then the required images have been calculated and all the ambient data generated of above! For a complete discussion please see the reference listed below the more light the sensor needs activate... A more detailed description of lighting units, see the square one wiki topic on light measurements the light. Have to keep the same value my spectromaster does slightly depending on time of day, conditions as...

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