Full sunlight is about 100000 lumens per square meter at maximum surface intensity, with less at dawn and dusk and far less < /s> at night. A four inch diameter light pipe will get a maximum of 810 lumens of sunlight. That's similar to a 60 watt incandescent. So he's essentially putting in 4 inch diameter skylights.
posted on 03/08/2011 8:52:15 AM PST
(Washington is finally rid of the Kennedies. Free at last, thank God almighty we are free at last.)
Allowing the radiation area to protrude into the room seems to be the advantage offered.
posted on 03/08/2011 9:01:47 AM PST
(The Second Amendment, A Matter of Fact, Not a Matter of Opinion)
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