I guess you could screw or double-sided tape them, I have a smaller
circular one and just used an adjustable cutter to make a suitable hole
in the ceiling for it, they're no deeper than the plasterboard.
Some manufactures sell special brackets to allow the panels to be
surface mounted - double check first that these allow the use of the
driver without having to bash a hole in the ceiling to hide the driver!
The slimline ones would need a hole bashing in the ceiling.
Their efficiency is improved by the fact that they only light up on one
side. I suppose you really ought to be comparing the LED panel
light/lumens with one of the ceiling grid panels that uses 4 x 18 2ft
tubes (say 1150 lumens per tube) that they are usually used to replace.
Then imagine some losses in the old fitting as not all the light is
Another advantage of the LED is that is will stay at full brightness for
Kitchen 24 ft long previously had 9 x 60w halogen lights, replaced with
4 x 6 inch panels 12w LEDs, much brighter and `she` likes it.
Flush fitting to ceiling so had to cut out hole in plasterboard ceiling.
All semiconductors age. They age faster at high temperatures.
Performance generally changes gradually.
If you are interested this is MOSFET oriented, but still relevant
As for LEDS..
"In conclusion, commercially available blue LEDs have
been subject to accelerated DC ageing process and their
electrical and optical characteristics are measured. It is found
that both characteristics are degraded after each ageing cycle:
the ideality factor and the reverse saturation current in I-V
characteristics increase while the peak wavelength intensity in
the electroluminescence characteristic decreases. We attribute
the degraded characteristics to the formation (or activation) of
mid-gap energy levels which can effectively function as non-
radiative recombination centres in the forward-biased mode,
and generation centres in the reverse-biased mode."
In other words, electricity starts to be used to do other stuff than
emit light, over time.
"Anyone who believes that the laws of physics are mere social
conventions is invited to try transgressing those conventions from the
Slowly. And over quite a longish period. From more than adequate for the
job to useless. The replacements from the same batch have started to do
the same. They were just generic bought from Ebay - but not the very
cheapest. First time I've seen this happen.
*Welcome to Shit Creek - sorry, we're out of paddles*
Dave Plowman firstname.lastname@example.org London SW
I looked at these but it was for a 5m long room which currently has a
single centre light. I was suspicious that the beam angle of 120 degrees
would be insufficient and I would need multiple panels for reasonable
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