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Does luminous efficacy differ between direct and reflected sunlight?
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[QUOTE="sophiecentaur, post: 6524641, member: 199289"] I don’t think there could be any other difference apart from that due to the actual reflectivity of the reflector surface. If a reflector has a selective filter on its surface then the filter pass band (say the visible region) would probably introduce more loss than a good mirror. Total internal reflection can be used to minimize losses - as in the prisms in binoculars - but that would be hard to use on a large area reflector. But if you want ‘cool light’ then a filtering reflector would work and your illumination would not suffer much. People often use Super Glass on large windows which both reduce incoming IR and, in winter, reduce IR heat loss. The slight tint on my conservatory windows is hardly noticeable. [/QUOTE]
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Does luminous efficacy differ between direct and reflected sunlight?
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