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1937 - Left: double bulb, 400 watt, 16,000 lumens.  Middle: 250 watt, single bulb, 7500 lumens.  Right: double bulb, 85 watt, 300 lumens

400, 250, AND 85 WATTS

CD 1964050 E&MP27.008

Electric Lighting

1937

Three commercial types of high intensity mercury vapor lamps. Left: double bulb, 400 watt, 16,000 lumens. Middle: 250 watt, single bulb, 7500 lumens. Right: double bulb, 85 watt, 300 lumens. 







Original Caption by Science Service
Westinghouse



National Museum of American History

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