Illuminance is the density of light on a surface, and it is measured in units of lumens per square meter (lux, abbreviated lx) or lumens per square foot (foot-candles
, abbreviated fc).
In general, the study found that sites with lighting levels below three foot-candles
were given low security ratings, usually between -4 and 1.
Guidelines established by the USDA (5) for meat and poultry are similar; all areas where utensils are produced, packaged or washed must meet a minimum of 30 foot-candles
. However, inspection stations must be either 50 or 200 foot-candles
depending upon the type of inspection area.
The new court lighting package delivers light levels of more than 16 foot-candles
across the full playing area, while achieving extremely even light levels, a max/min ratio of only 2.71.
Light is measured in foot-candles
-- the amount of light cast on a square foot area by a candle at 1 foot distance -- and the sun on a clear summer day can bathe us in 10,000 foot-candles
When I converted foot-candles
to lux, I noticed how
Rechargeable batteries power XV1 for a full day's work, delivering up to 4,000 foot-candles
The UV-B (312nm) intensity of the Bi-O-Vision can be adjusted without preset stops--its ranges go from 6,000 to 3,000 [micro]W/[cm.sup.2] and the white light output can be regulated to fall between 1,000 and 2,000 foot-candles
(93 to 186 lux).
The UV-B (312 nm) intensity of the series can be varied without preset stops, from 6,000 to 3,000 [micro]W/[cm.sup.2], and the white light output can be adjusted from 2,000 to 1,000 foot-candles
(186 to 93 lux).
For example in Normal Mode, 170,000 LUX or 17,000 foot-candles
of light is available, while in Turbo Mode, illumination can be increased to 220,000 LUX or 22,000 foot-candles
The lamp's visible light emission is less than two foot-candles
, and it easily meets MIL and ASTM specs for FPI and MPI.