On Mon, 16 Feb 2009 07:12:24 -0800 (PST), Adam Aglionby
wrote:

[snip]

Unfortunately not even close, LED is currently almost never a
`straight replacement` for halogen lamps, there getting better on an
almost weekly basis but having worked with LED sources for more than
10 years, they still are not a straight drop in replacement for a 50W
12V MR16 or even a GU10 MR16.

Adam,

One reason why there are no "real" drop-in replacements for
50-watt MR16 lamps is that the MR16 form factor does not
provide enough heat sink area for any current-generation LED
that creates as much light as a 12-volt, 50-watt halogen
lamp.

There are LED-based MR16 lamps that replace 20-watt halogen
MR16's because they have lower power dissipation
requirements. These are indeed more efficient than the
equivalent halogen, but certainly not by nine times! About
twice last time I checked.


--
Vic Roberts
http://www.RobertsResearchInc.com
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