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The $10 bulb provides light equivalent to that from a 40-watt incandescent.
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.
Similar(50)
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.
There are lighter equivalents elsewhere, but they are scarcely easier to fathom: Saw A. and B. last night.
Because of its altitude (5,280 feet), "Denver has a light intensity equivalent to Cairo," Mr. Nold said.
An ancient Babylonian, he calculated, needed to work more than forty-one hours to acquire enough lamp oil to provide a thousand lumen-hours of light — the equivalent of a seventy-five-watt incandescent bulb burning for about an hour.
Calculations suggest that the clump of dark matter associated with cluster of four galaxies is offset in space by a distance of about 5,000 light years, equivalent to about 50,000 million million kilometres – a distance that would take Nasa Voyager spacecraft, the most distant man-made object, some 90 million years to travel.
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