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What is the difference between photoluminescent and LED emergency exit signs?

Photoluminescent exit signs absorb and store ambient light, then emit a glow during darkness or power failure — completely passive, zero power, zero maintenance. LED exit signs with battery backup are electrically powered with built-in batteries for power failure. NBC 2016 recommends photoluminescent signs for standard exits and corridors; LED illuminated signs are preferred for areas requiring continuous high-visibility lighting regardless of ambient light levels.

What is IS 15988 and why is it critical for fire exit signs?

IS 15988 is the Bureau of Indian Standards specification for photoluminescent safety signs, specifying minimum luminance levels and glow duration after a standard 15-minute light charge. Compliant signs must maintain minimum 0.32 mcd/m2 luminance for at least 60 minutes. Non-compliant signs may glow brightly initially but fade to invisible within 10-15 minutes — precisely when evacuation is most critical.

Are fire exit signs required by law in all Indian buildings?

Yes. The National Building Code 2016 Part 4 (Fire & Life Safety) mandates illuminated or photoluminescent fire exit signs and evacuation route marking in all public buildings, commercial establishments, industrial facilities, healthcare buildings, hotels, and residential complexes above certain occupancy thresholds. Fire NOC from state fire departments cannot be issued without compliant exit signage installation.

What is the NBC 2016 requirement for emergency exit sign battery backup?

NBC 2016 Part 4 requires emergency exit signs in buildings with electrical lighting to have a minimum 3-hour battery backup to ensure guidance throughout any fire evacuation scenario. Many cheaper LED exit signs offer only 1-hour backup — this is non-compliant and will be flagged during fire NOC inspection.

How far apart should fire exit directional signs be placed?

IS 15988 and NBC 2016 guidance recommends directional signs at every decision point (corridor junction, staircase entry, door) and at maximum 20-metre intervals along straight escape routes. In smoke-prone environments, supplementary floor-level photoluminescent path markers should be placed every 1-2 metres along primary escape routes for guidance when occupants are crawling below smoke level.