And it doesn't take very much light to confuse them-- about 10 foot candles, " he said, noting street lights, headlights or porch lights would compromise the process.
12.
Below downtown Seattle, the 1, 200-stall Pacific Place garage is literally as bright as day thanks to white metal-halide bulbs cranking out an average of 7.5 foot candles of illumination.
13.
As there are strict requirements to provide an average of one foot candle of light along the path of egress, emergency lighting should be selected carefully to ensure codes are met.
14.
Below downtown Seattle, the 1, 200-stall Pacific Place garage is literally as bright as day thanks to white metal-halide bulbs cranking out an average of 7 . 5 foot candles of illumination.
15.
That's about 14 times the brightness given off by the amber lamps at the Sea-Tac garage, where Jacobson said the lighting level is about one-half a foot candle _ roughly the visibility of the desert in a full moon.
16.
In the same year the development and acceptance of higher foot candles approved by the Illuminating Engineering Society made it possible for the industry to promote heat-by-light installations that by the 1970s became common in many downtown Chicago all-electric buildings.
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