"whisky-dave" wrote in message
news:fm7rco$9li$1@qmul...

"Jan Wysocki" wrote in message
k...
On 2008-01-10, Mary Fisher wrote:

"Roger Mills" wrote in message
...
[snip]

Some rooms have low voltage halogen downlighters. What am I supposed to
replace *those* with?

If they're MR16s, then there are 3 and 4W LEDS available (search for
Brilux/Luxeon/Cree MR16)

I've seen some 5W MR16 they recon they're equiv. to 20w halogen. £15

http://www.rapidonline.com/productin...du leno=78803


One thing that I haven't seen discussed is the health issue as a product
of brightness.
A friend has tried reading under LED lights and gets eye strain I believe
this is due to
the limited real brightness. Our eyes adapt in dim lights but don;t work
as efficiently
and our dept of field (what's in focus), and dim light does cause eye
strain.
So I'm a bit concerned about using dimmer lights to be green if my eye
sight suffers
in the long term.

I'd also like to find out for myself just how bright a light is rather
than rely on
the manufactures weighted & obscure specifications.
I'm thinking along the lines of using a digital camera as a light
measuring tool.

As someone else, perhaps not here, the matter of perceived brightness is
subjective.

Mary