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Comprehensive buyers guide to
outdoor solar lighting products from OkSolar outdoor solar lighting businesses
worldwide.
OkSolar offers a
comprehensive buyers guide to outdoor solar lighting products from outdoor solar
lighting businesses worldwide. Types of solar lighting systems, Solar Lighting Systems solutions, solar lighting, solar lights, solar
lighting systems, solar energy, roadway lighting, alternative street lights,
alternative lighting units, area lighting, outdoor area lighting. [00/i_lighting.htm]
Area Lighting Lumen - Candela
I assume
your reference to "IES" is the Illuminating Engineers Society standards for
measuring light output.
The lumen rating of these fixtures is determined by the
lamp manufactures. e.g., initial rating for the 35 watt Low pressure sodium lamp
is 4600 lumens. When this lamp is mounted in our enclosure measured light output
is 2.2 to 2.5 times that of a non-enclosed lamp. Our model LPS-135LT produces
approximately 10,400 lumens. The enclosure acts as an amplifier by redirecting
the light in an arc < or = 180 degrees.
Approximate lumen readings are calculated in the field
in the following manor: a light meter is placed at a distance at least 5 times
the greatest dimension of the source ( 5 x 12.25" = 61.25 ") from the light
source. The lamp is allowed to reach full brightness. Foot candles are measured
at a distance of 6 ft from the fixture. We recorded a reading of 23 FC at this
distance.
Mean spherical candle power ( Foot-candles x D squared
where D = distance in feet from the light source ) = Lumens / 12.57.
23 x 6' squared = 828
828 x 12.57 ~/= 10,408 lumens .
comprehensive buyers guide to outdoor solar lighting products from
outdoor solar lighting, A Solar Lighting Systems solutions, solar lighting, solar
lights, solar lighting systems, solar energy, roadway lighting, alternative
street lights, alternative lighting units, area lighting, outdoor area
lighting.,8
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