Lines of equal lux (or foot-candles
) are drawn on a photometric plot to show how much light is hitting the ground and where.
For example, properties with nighttime lighting systems that provided three to seven foot-candles
received similar ratings of between 3 and 4, with one site receiving a rating of almost 5.
Most flowering and fruiting plants need 1,000 or more foot-candles
, although some, such as African violet, rex begonia, flowering maple, zebra plant and crown-of-thorns, will provide colorful displays even at about 500 foot-candles
Therapeutic levels under light therapy are typically at least five times higher (as measured in lux or foot-candles
by a light meter) than that provided by ordinary indoor lamps and ceiling fixtures in the home or office.
Lighting levels in supermarkets--which averaged about 100 foot-candles
in the '90s--are now about 70 foot-candles
, according to Steven Grimshaw, owner of Lighting Solutions, a Falmouth, Maine-based lighting consultancy.
The lights can be operated at 100 foot-candles
for television, 60 foot-candles
for night meets and 30 foot-candles
Students measuring the light intensity in classrooms when every fluorescent overhead light fixture was in use found that the bulbs were emitting 120 foot-candles
, the standard unit of light intensity.
The resulting lyricism moves effortlessly from the firmly tongue-in-cheek ("The Color of Your Blues") to the dry love-gone-bad metaphors of "Radiate Nothing" ("the foot-candles
you stood in/they are now so dim") to the painfully sincere and endearing (the sunny, French horn-led "Eyes That Ring").
With up to 1,200 foot-candles
of light, this LED PR bulb provides common flashlights with a bright, solid-state, durable and weather-resistant lamp with no gases to heat, filaments to break, or glass globes to shatter.
Smith checked the light levels in his 10,000-square-fore store and discovered readings between 8 and 46 foot-candles
. He decided to install brighter lights as pan of an overall store reset.
For large open areas, 0.5 to 2 foot-candles
average is sufficient.
The court found that lighting in each death row cell was less than twenty foot-candles
, in violation of the constitutional rights of the class members.