Contractor shall provide photometric design that meets the minimum horizontal and vertical
foot-candle requirement for outdoor basketball court.
The supplier went above and beyond to provide lighting schematics,
foot-candle specifications and a knowledgeable contractor to make the transition simple and easier to manage.
1
foot-candle (0 and 1 lux) are significantly higher than for other levels.
Control logic governs shade operation and artificial lighting levels, maintaining a uniform level of 20
foot-candle ambient light for occupied laboratory spaces regardless of the time of day.
Ample use of color also played a leading role in giving each department its own unique ambiance, as did the selection of the light fixtures, the
foot-candle contrast in each department, and the sleek use of graduated ceiling planes in several of the departments.
Measurements were made in
foot-candles, to a 10th of a
foot-candle.
The measurement they used in their research was the
foot-candle, or the amount of light put out by one candle, one foot away.
We recently conducted a research project in which the dining room provided only five
foot-candles of light at the table, which is well below the 50
foot-candle recommendation.
At the meeting George Brainard (Thomas Jefferson University) demonstrated how our body stops producing melatonin --an important hormone that affects sleep, aging, and reproduction--when exposed to even a tenth of a
foot-candle of certain wavelengths of light.
The article "Relighting a Hangar"--one of the aeronautic theme stories in this issue--described how the Minnesota Air National Guard's maintenance hangar transitioned from a 5-10
foot-candle mercury and incandescent system to a 1,000-W high-pressure sodium layout offering 100-plus fc using the same grid spacing.
1
foot-candle --roughly 10 times that from the full Moon.
People also had trouble with colors viewed under light from high-pressure sodium lamps at light levels below one
foot-candle.
