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LUMINESCENT INTENSITY of 40 Watt and 20 Watt halogen bulbs


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Short answer, candela is a measure of intensity of directed light , it isn`t a measure of the total light output of a source.


Total Luminous Flux, measure of all the light output by a source in all directions, is measured in Lumens.


Longer answer, Light Measurment Handbook, free PDF download




Don Klipstein`s site



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