Yes, a surprising range for what is an infant industry. The price
variability is impressive, from around £5 to over £100 for an MR16 12
volt halogen replacement. The price is no guide to the quality or output
illumination, with the cheaptest units being 24 LED clusters sold by an
American company and the most expensive being 48 LED clusters sold by
another US company (the latter beign quoted as "incandescent white"). In
Australia it's possibel to buy DIY lightbulb kits consisting of the base
to which you must add the LEDs yourself.
Try a Google search on [ LED white replacement MR16] or [ LED white
replacement GU10 ] for more details. The power consumption is about 2-5
watts per bulb and the light output appears to be equivalent to a 20W
incandescent. The makers quote 50,000 hours life, but a recent R4 news
item mentioned that 150,000 hours is more typical for an LED.
Already exists -- Philips QL lamp (electrode-less compact fluorescent).
AFAIK, not available to the public because they are expensive and the
long life depends on specially designed fittings. Used for the back-
lighting of Big Ben's clock faces, amongst other things.
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