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Can anyone beat 20W CFLs @ 8 pence easch ? - Page 10

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Posted by Eeyore on May 20, 2009, 8:03 pm
 


Ben Bradley wrote:


There are some very interesting new developments on the 'white' LED front.

Trouble is they have heatsinking problems too ( and life drops horribly when
they get too hot ), plus efficiency drops off at higher operating currents /
temperature ( normally not the quoted headline figure of course ) plus the
best efficiencies are at the blue end of the spectrum. Expect say 1/3 less
lumens at more 'normal' colour temps.

Having said that, OSRAM recently announced their latest 'TOPLED Plus' with an
efficiency ( parameters unspecified ) of 95 lumens / watt. That's quite good.

Graham



Posted by G on June 10, 2009, 4:45 pm
 

They now make a pop off glass top, separate from the base by grabbing
the coil. They have been doing that a long time in the elongated
socket types. I just put in an order today for some spots 9watts at 40
halogen equiv. I see many dimmable types now down to the $1 level.
There are companies making low mercury types. I also see up to 500
watt equivalent. Led replacements have come down in price. If you
limit the area degrees of light, they are great. Warm colors are now
common place.

Had to use Google to go back to the achieve. That's the only way I can
do it since my preferred reader does not save posts. Least here I got
spell checking, and I don't care who does not see this post.

greg


Posted by GregS on June 10, 2009, 4:53 pm
 
I have not really seen a good "spot" out of a CFL. The spots
they sell are almost all floods. The glass flat front types are the best.

There is also that cold cathode type I forgot to mention.

greg


Posted by GregS on June 10, 2009, 4:57 pm
 (GregS) wrote:

I'm not sure why even bother with CFL's allthough I like the less
heat factor. My electric bill last month was $0.

greg

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