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Yet changing light fittings is expensive, and so are the bulbs themselves: an incandescent bulb costs less than $1, but an LED equivalent is $60, though it is said to last 40 times as long.
Philips recently became the first entrant in the Energy Department's L Prize, a race to develop the first practical 60-watt LED equivalent to a standard light bulb.
The newest LED equivalent to a 60-watt bulb costs more than $40, compared with around $1 for a regular bulb.
This October, G.E. will introduce Energy Smart, its 40-watt LED equivalent that uses 9 watts of power; a 60-watt equivalent will be announced in a few months.
Two categories were established: a 60-watt LED equivalent to the standard light bulb, and a new version of the large PAR 38 reflector lamp commonly found on ceilings.
The third company, General Electric, will sell an LED equivalent to a 40-watt bulb this year, but it will not have a 60-watt replacement ready until 2011.
Similar(54)
The Energy Department says that if all those lamps were LED equivalents, enough power would be saved to light 17.4 million American households and cut carbon emissions by 5.6 million metric tons annually.
There were also thresholds that led to equivalent performances using both sets of references.
In summary, the mPCL TCP scaffold with the lower rhBMP-7 dose led to equivalent results to autograft transplantation or the high BMP dosage.
The use of either genus or family level led to equivalent representation in each system in terms of taxon richness and both the Margalef and Shannon-Wiener diversity indices.
Genetic silencing of Nicastrin and Notch4 led to equivalent effects.
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