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Plate 7:  Two different incandescent lamps compared
(This plate added FEB 2004)

HE accompanying photo shows the two different incandescent lamps which are both used, at different times and for different purposes, in the lighting fixture shown in Plate 6.
The lamp on the left, used for photographic sessions of brief duration, is a 100-watt indoor-outdoor floodlamp rated by the manufacturer at 1,400 lumens. The lamp on the right, for everyday use, is a 60-watt incandescent bulb rated at 840 lumens.

--more-- 		SUBJECT: 100-watt floodlamp and 60-watt standard lamp CAMERA: Sony DSC-P92 Cyber-shot MEDIA: Sony MSA-64A Memory Stick at 1.2 megapixel resolution FILE: JPEG from Sony Image Transfer version 1.00.1015.01 EDITING: Adobe Photoshop
A lumen is an amount of light (known as luminous flux) which streams outward within a restricted angle from a source of illumination having an intensity of one candela. A candela, or new candle, is a measure of the intensity (brightness) of a source of light.

A watt is a unit of power. The electric power that is consumed by the lamps shown in the photo is partially converted to heat, and partially to light. The number of lumens divided by the number of watts for each lamp is 14. That is, each of the two lamps in the photo provides 14 lumens of light for every watt of power consumed.

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