Although people can discriminate objects and colors under both types of lamps when light levels are abundant, metal halide offers more accurate vision at low light levels, especially below three foot-candles
You can translate those needed foot-candles
into light measured by a digital SLR camera.
of horizontal illumination on the ground and 0.
The problem is that when local TV wants to broadcast a basketball game, the 50 foot-candles
aren't always enough.
are the measurement of light on the vertical plane with the meter held horizontally.
It is important that the ambient illuminance not exceed recommendations for spaces with video display terminals (VDTs), 25 to 50 foot-candles
of uniform ambient lighting.
, cadets correctly identified an object only 4 times; they misidentified or said they could not identify an object 44 times.
Throughout the store, lighting levels have been increased from the traditional a foot-candles
to 52 foot-candles
Apparently no one has studied this intriguing question, but we do know that the intensity of white light has to be at least 40 foot-candles
(lux), and that an average of 100 lux for 16 hours will stimulate body growth and milk production in dairy cattle.
An improved, crack-resistant filter reduces visible light (less than 2 foot-candles
or 20 lux) while maximizing long wave UV irradiance.
The new lighting system, Menders said, will be able to perform at three different levels - 100 foot-candles
for television, 60 foot-candles
for night track meets and 30 foot-candles
We put the lighting where it is needed and weren't so concerned about flooding every square inch of the store with a continuous 80 foot-candles