(Andrew Gabriel) wrote:
In article ,
Bruce writes:
Gordon Henderson wrote:

I've just replaced a fixed outdoor light with one of these:

http://www.tlc-direct.co.uk/Products/TL3500A.html

CFL. Instant start to full brightness. Works a treat. Very bright indeed.

"Brightness is equivalent to about 300W incandescent lamp."

That's a lie, for a start.

It's probably nearer to 100W linear halogen in that application.
The large size of the light source and self-shadowing of the tube
severely impact the overall efficiency in reflector applications
like this, so you're probably looking at a 3:1 ratio.


That's more like it.

I might even have been slightly more generous,
and allowed a claim of 4:1. But 8.3:1 ?

(300/36)