On Sat, 6 Jul 2013 22:52:34 +0100, "Jim Hawkins"
wrote:

polygonum wrote:
On 06/07/2013 19:07, Jim Hawkins wrote:
Looks like we won't be getting LED lamps with a decent
light output - say 2000 or 3000 lumens or so - until the
manufacturers learn how to make LED chips in larger sizes.
Are there problems in doing this ?

Jim Hawkins




Manufacturers appear to have learned in the last 22 minutes... :-)

http://uk.mouser.com/ProductDetail/C...0-000N00Y250H/

6430 lm

Thanks for the reference. It's interesting, but their day white chips are
only 100 lumen each, and the warm white ones only half that.
And they appear only to fabricate them into strips of six chips.
I think there's still some way to go before we get any 300 X 300 mm
ceiling panels producing 2000 - 3000 lumens.

Jim Hawkins


7830lm from 50mm x 45mm element.

http://www.led-tech.de/en/Chip-On-Bo...8_134_210.html

Even TLC do LED panels, 3546lm 600mm x 600mm

http://www.tlc-direct.co.uk/Products/LTMOD45DL.html