Lux Level Caculations

It is not clear what formula you need. Here is some lighting information, formula and web link that might help:

Lumen and Candle Power (candela) = The way of measuring how much light is produced by a light source

Candle Power = 12.57 (4xPI) Lumen

Lux and Foot-candles = The way of measuring the intensity of light falling to an object.

Lux = Lumen/sq. meter (lux is also called meter-candles)

Foot-candles = Lumen/sq. feet

Foot-candles = 10.76 Lux

Average Maintained Illumination (Foot-candles) = (Lamps/Fixture x Lumens/Lamp x No. of Fixtures x Coefficient of Utilization x Light Loss Factor) ÷ Area in Square Feet

Required intensity of light (foot-candles) for different areas:

General Office/Control room - 50

Switchgear room/Generator building - 30

Desk Office/Workshop/Ware House - 70

Walkway/Stairway/Open Deck Area - 5

http://www.lightsearch.com/resources/lightguides/formulas.html

- MS