See CPC are selling what appears to be the same unit as TLC - but a lot cheaper. 17.39 against 23.99 both before VAT.
=A0 London SW
Figure a Cfl to be 75% more efficient, so the bulb equals maybe a 145 incandesant, the reflector is the gimmic to double output. It really is LPW Lumen per watt, that is the number you need to compare off the bulb data.
=A0 =A0 London SW
75% would be a darn good CFL against a poor halogen, but its at least 50% more efficient.Unfortunately reflector won`t double output, no reflector is 100% reflective, aluminium is sub 90%, then lamp obscures some of reflected output and convoluted nature of lamp obscures some of its own output.
l/W is a good measure of raw light source efficiency but its capable of being massaged to look more impressive than it actually appears outside the lab.
It will be quoted as source efficiency , at whatever weird voltage and current the light up bit actually runs at, fluro, HID and LED all require some sort of ballast or driver that loses some power in the conversion. The best will manage 90% efficiency , old magnetic fluro ballast will be a lot less. These are typically left out of l/W figures.
LEDs efficeincy drops like a stone as they warm up, LEDs efficiency is quoted at running temp of 25 degrees , virtually unobtainable in the real world
Loses in the reflector and or optics, l/W tells you nothing about how much light is actually delivered where its is needed.
Could do with wall plug efficiency figures, how much light usefully deployed for actual billable watts consumed, even then lies ,damned lies and statistics wouldn`t make it any easier.
Adam
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