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A pack of three 11-watt G.E. compact fluorescent bulbs -- each the lighting equivalent of a 40-watt incandescent bulb -- was priced on Thursday at $15.88 on Wal-Mart's Web site for pickup in a Nashville, Ark., store.
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Is there a light equivalent of SAD? SOD - sunshine overload disorder?
The $10 bulb provides light equivalent to that from a 40-watt incandescent.
The bulbs use LEDs from Cree and give an amount of light equivalent to a 60-watt or 40-watt incandescent lamp.
Osram Sylvania has announced that it is now selling a light-emitting-diode bulb that emits light equivalent to a 100-watt incandescent.
An L.E.D. floodlight -- a clear plastic Series R30 "warm white" (though still blue-tinged) from Ledtronics -- has five times as many diodes and offers light equivalent to a 65-watt incandescent bulb; $170 at (800) 579-4875 or www.ledtronics.com.com
He has suggested that "a mirror system in space could provide the light equivalent of many full moons so that there would be no need for nighttime lighting of the highways".
A chart last Thursday with the Pragmatist column, about light bulbs, misstated the average cost of an L.E.D. bulb that delivers light equivalent to that of a 60-watt incandescent.
Well, the bulb only consumes six watts of power and puts out light equivalent to a standard 60-watt bulb.
To test whether illumination by blue light is non-destructive to microbes, we exposed test strains to levels of light equivalent to 10 times that which they would be exposed to during normal operation.
The production of photosynthetic pigments is not repressed in aerobically growing cells by illumination with dim light, i.e. below 2000 lux of incandescent light (equivalent to 40 µE m−2 s−1).
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