What is 54 lux?
54 lux (5-foot candles) is a measurement of light levels on a surface. 54 lux is the minimum level of fluorescent light that must be on the sign face at all times during building occupancy for all externally illuminated exit signs as required in OSHA 1910-37 q6 and NFPA Life Safety Code 7.10.6.3. Energy Star has reported that the average office in the U.S. measures a level of 50 lux. However, the only accurate way to check the amount of light on the sign face is with a light meter. Most electrical contractors or building facilities departments have access to this device, and confirmation of sufficient light levels should be done at installation.
