The first thing to determine is the number of horizontal footcandles
(lumens per square foot) required on the pavement for various conditions.
LEDs also offer the benefit of optics that place light exactly where it should go instead of letting it spill out, allowing you to maintain a uniform footcandle
level instead of intentionally overlighting to make sure the poorest-lit areas still meet the minimum requirement.
Note that recommended light levels are always for average maintained footcandles
Basic to the process of measuring footcandles
is the availability and use of the proper measuring device.
The National Institutes of Health's design guide lines specify that laboratories should have lighting levels of approximately 80 footcandles
, 15 times more light than the fluorescents provided.
(a 109% increase) and uniformity at an average/minimum ratio of 4.
The best lighting advice: How perceived lighting is more than actual footcandles
The lamp has a rated life of 4000 hours, and provides 3700 footcandles
at 36 inches from the work plane.
diagonally, with the light levels generally 10 footcandles
Most labs need 50 to 70 footcandles
of general lighting, plus selected task lighting of 100 footcandles