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This incandescent filament bulb is back-filled with Krypton gas which helps to recycle the filament material back to the filament wire which allows the bulb to glow brighter for a longer time. The filament for this lamp is sized to work adequately with a 2.5 to 3 volt AA power source. This lamp housing is the standard PR3 flange base which makes it a good replacement for flashlights using 2 Nicads or NMH rechargeable batteries that only put out 1.2 volts per battery rather than the 1.5 volts of alkalines. They work well and are slightly brighter than standard bulbs but like the standard bulbs the light is retro-yellow. Unlike LED bulbs, filament bulbs are inherently not sensitive to the battery polarity and work with AC or DC power sources. White LED bulbs require a power PCB to work in low voltage flashlights. All filament bulbs waste a considerable power as heat and these are no different. Read full review
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