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An investigation found that Emergency lights and Exit signs were not properly illuminated, and the landlord was fined $21,000 for "not properly illuminating exit signs and having no record of emergency lighting tests", and another $50,000 for other infractions to the code relating to fire doors.
As tritium illumination requires no electrical energy, it has found wide use in applications such as emergency exit signs, illumination of wristwatches, and portable yet very reliable sources of low intensity light which won't degrade human night vision. Gun sights for night use and small lights (which need to be more reliable than battery ...
It is used on wristwatch faces, gun sights, and emergency exit signs. The tritium gas is contained in a small glass tube, coated with a phosphor on the inside. Beta particles emitted by the tritium strike the phosphor coating and cause it to fluoresce, emitting light, usually yellow-green.
A cold-cathode fluorescent lamp from an emergency-exit sign. Operating at a much higher voltage than other fluorescents, the lamp produces a low-amperage glow discharge rather than an arc, similar to a neon light. Without direct connection to line voltage, current is limited by the transformer alone, negating the need for a ballast.
A hallway under regular lighting (left) and emergency lighting (right) US-style emergency lighting fixture An emergency light is a battery-backed lighting device that switches on automatically when a building experiences a power outage.
One very important standard is part 1 of the IEC 60598, which specifies general requirement for luminaires incorporating electric light sources for operation from supply voltage up to 1000V. Section 22 of Part 2 (IEC60598-2.22) which is an additonal standard to part 1, specifiy requirements especially for emergency lighting including exit signs.
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