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How much lumens per square foot a garden should get?

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Gardens should receive 1000-3000 lumens per square foot. Successful gardens usually are lit at around 2,000 lumens per square foot. During the vegetative stage, plants stretch out when they receive low levels of light. During flowering, the flowers are looser and sparse.

Posted on Aug 27, 2008

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Posted on Jan 02, 2017

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the intensity of illumination of light source varies inversely as the square of the distance between the source and the piont at which the measurement is taken. if =20 lumens when d=5 meters, find i when d=2 meters

on Mar 02, 2010 | Eagle Summit Cars & Trucks

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Technical data


lumens is a measure of light intensity
the lower the number the duller the light, the higher the number the brighter the light average shops have a level of limens around 750 as this is the safe light level for eyes
Wattage is current flow ( amps) and was used as a measure to show the intensity of the light
12 watt bulb is dull in 240 volts situation where a 500 watt bulb as in ( quartz halogen bulbs) is something that will blind you
You will notice a change in readings from incandescent bulbs-- the old units that had a filament in them--20 watt, 40 watt,60 watt, 100 watt to fluorescent lighting where the power saver bulbs have a rating of 12 watts is equal to 60 watts of the old bulb ( a rough attempt to show the lumens ratings )
this was an attempt to compare the light intensity so that customers could see how bright the new bulb would be
Now that there are LCD units , the wattage is so low that a comparison cannot be made so the shift is to lumens as a measure of light intensity ---in reality the results are the same
for example a torch with 3 X aaa batteries as a low lumen rating as you can see by the brightness of the light and if you compare that with the lumens rating of driving lights that light up the road for miles
the wattage(amps)for the big lumens rated lights will still be low compared to the head light s in current use

Mar 10, 2016 | Televison & Video

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The lamp exploted in less than 30 hours of use, replaced an exploted in 4 hours, replaced and exploted in 5 minutes what can I do?


Is it the correct bulb? Or recommended bulb? Try a higher wattage or lumens. I'm not sure what the lamps in the projectors are called, but check on the wattage and lumens.

Dec 07, 2014 | Optoma EP739 Multimedia Projector

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How many 1"x4"x8" clay brick


792, minimum (assuming you're putting the 4x8 side up). Each paver is four by eight inches, or 32 square inches. Since there's 144 square inches per foot, we know that each paver is 0.2222 square feet (32/144). 176 square feet divided by 0.2222 square feet per paver is 792 pavers.

Sep 18, 2011 | Garden

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Fujitusi multimedia projector about its lumens and prices


The Fujitsu LPF 4800 has 1500 lumens and was first sold back in 2001. Then 3 years later they stopped selling it. It cost about US$6000 when it first hit the market.
Hope that answers your question.

Mar 18, 2011 | Fujitsu LPF 4800 Multimedia Projector

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Proxima DT 5800 works but picture is much brighter with the lights out ,what could cause to be not as bright with lights on?


The Proxima DP5800 projector is a small format low powered projector at only 650 lumens (brightness measurement). It simply doesn't have enough lumens to cut through ambient light and display a clean image. It is best used in a dark room.

Also bulb age will play a factor in overall brightness. The lamps for that projector are only rated for 700 hours, and as they near the life expectancy they can lose up to 50% of their lumens.

Mar 09, 2011 | Office Equipment & Supplies

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A 40 W fluorescent lamp gives out more light than a 4o W filament bulb.explain whether the fluorescent lamp is actually using electrical energy at the same rate as the filament bulb??


The lamps are both using 40 watts of energy, but the fluorescent lamp gives more lumens (visible light measurement) than the incandescent.
Fluorescent gives at least 5000 lumens for 100 watts.
Incandescent gives 1750 lumens for 100 watts.
You can see that if you had a 100 watt incandescent, it would be 1750 and you would only need 35 watts of flourescent.
Gary

Feb 19, 2011 | Vacuums

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