A Study of Direct and Indirect Illumination (Classic Reprint) - Softcover

Inhaltsangabe

Excerpt from A Study of Direct and Indirect Illumination

In order to compare different systems of illumination there must be some means of comparison. Consequently we have the candle power, foot candle, mean spherical candle and etc. The candle power is the unit by which the intensity of a source is measured. Thus a light is said to have an intensity of one candle power when it has the same intensity as a sperm candle which burns 20 grams of sperm in 10 minutes. This is the English unit of intensity. The German unit is 9 of the English.

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