Eeyore wrote in
:

Definitely smaller size, so if you're going to be a stickler for full
context such as analysis of lumens per watt of actual mains input,
you must take all of the context. People have alreay said (rightly)
that LED lamps won't have the trouble that CFL's have in fitting most
current luminaries.

Well actually I wonder about that. Especially replacements for those
'low voltage halogen' types like these.
http://www.lightingfx.com/item--Halogen-GU10--51

There's not actually any easy way to lose the heat. The 'enclosure' is
very small.


No fair! You try fitting a CFL in there. That's why you're pulling
teeth out of the biting argument in favour of LED's isn't it? Most of the
time in this thread you're advocating CFL's, so this is a spurious issue.

Actually, the Cliften Suspension Bridge in Bristol has its chains entirely
lit by exactly the type of LED-based lamp that replaces little tunsten
halogens. There are three emitters per lamp. The lowest is too high to get
a good look at, but they appear to be Cree or Luxeons in small parabolic
reflectors. Sure, a bridge doesn't have many cooling problems most times,
but those 'chains' are mighty plates of iron, and on summer nights they are
hot. Doesn't stop those lamps working though.