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re: best reflective surface for skylight shaft?
1 aug 2004
michael daly wrote:
>> full sun is about 10,000 footcandles. we can see in 0.1 fc,
>> ie we can "see through" something that's 99.999% reflective.
>
>i can see thru some aluminized mylar in a dimly lit room. my
>guess is that these are no more than 50% reflective.
you might see 0.1 fc in a 5 fc room through a 2% transmissive film.
>high-reflective aluminized mylar is harder to get and more expensive.
>if you're going to recommend al mylar, you have to be specific
>about the quality and reflectivity.
i like duraflex from graphic arts systems in cleveland.
about 10 cents/ft^2 in 0.002"x54"x100' rolls.
>it's a myth that mirror finishes (metallic coatings, polished
>metal etc) are great reflectors of heat and light. good quality
>white paint can outdo mediocre mirror finishes easily and are
>often a lot cheaper.
duane johnson gets great results with mylar heliostat mirrors.
nick
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