Performance Testing of LED Mogul-base Lamps
Mogul base LED replacement lamps are being marketed as equivalent replacements for incumbent HID
lamps. LRC characterized the HID marketplace and conducted photometric and electrical testing on 18
mogul base LED lamps to inform the DesignLights Consortium (DLC) on these products’ performance in
consideration of them being added to the Qualified Products List (QPL). LRC found that 4 of the 18 lamps
met the minimum tested DLC QPL criteria for retrofit kits when the lamps were placed in area lighting and
roadway luminaires. The wall pack and high bay luminaire combinations did not meet the applicable
tested retrofit kit criteria.
In Phase 2, LRC conducted photometric and electrical testing on 17 additional mogul base LED lamps to inform the Design Lights Consortium (DLC) on these products’ performance in consideration of them being added to the Qualified Products List (QPL). LRC found that 6 of the 17 lamps met the minimum tested DLC QPL criteria for retrofit kits when the lamps were placed in decorative outdoor luminaires, area lighting luminaires, roadway luminaires and high bay luminaires. The lamps tested in wall pack luminaires did not meet the applicable retrofit kit criteria. At ambient temperatures of 65°C, the relative light output of several tested high bay and wall pack lamp-luminaire combinations decreased by 20% compared to relative light output at 25°C.
Utilities have expressed concern that HID lamp sockets that have the ballast bypassed for LED replacement lamp retrofits could be eventually relamped with a conventional HID lamp. In Phase 3, 18 probe-start metal halide (MH) lamps of different brands, wattages and enclosure-ratings were operated with 277V applied directly to the socket. LRC found that 17 of the 18 probe-start MH lamps tested, ignited without a ballast when 277V was applied. Fourteen of these lamps experienced some type of failure. None of the 9 protected MH lamps, which are rated to be used in open fixtures, had an outer envelope rupture. LRC also found that in-line fast-acting fuses could prevent non-passive MH lamp failure when the lamp was operated at 277V.
The Lighting Research Center, Rensselaer Polytechnic Institute