What kind of light sources are effective for egress marking?
A luminous source of light is the best type of light to use because there are no hot spots or disorientating points of light as is found with most traditional light sources such as incandescent bulbs, LEDs and halogen lights. Luminous light sources are measured by the light given off of the whole surface of the light, which is expressed in units called Foot Lamberts or Millicandelas. 1 Foot Lambert (FL) equals 3426 mcd/m2. In heavy smoke conditions, bright point sources of light can create halos and light up the surrounding smoke which can further obscure the exit path markings.
