Screw Base Lamp

Some articles on lamps, screw base lamp:

Luminous Efficacy - Lighting Efficiency - Examples
2.8% tungsten quartz halogen (12–24 V) 24 3.5% photographic and projection lamps 35 5.1% Light-emitting diode white LED (raw, without power supply) 4.5–150 0.66–22.0% 4.1 W LED screw base lamp (120 V) 58.5–82.9 ...

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