In the new shop I am having built I want to use flush mount LED lights
in the ceiling.
Some folks say I need a can over them because the insulation will be
blown in. I don't know why since the LED lights don't produce much
Am I missing something or just plain wrong?
I would say at a minimum the cans should be used for esthetics if
nothing else. The cans will prevent the insulation from falling down
into the opening. It will also keep the insulations away from the
connection making it easier to repair or replace the ligth fixture in
I think the first question you should be asking is what is the building
code in your area. Cans may be required for the installation of all
types of lights.
Some lights, whether they be incandescent, fluorescent, or LED, are rated
for insulation contact (IC) and others are not. It will be clearly marked
on the fixture and the box. All of the dedicated LED flush lights I've
looked at have been rated IC but that doesn't mean that they all are. By
all means do it by code otherwise you might find your investment going up
in flames with no recourse to insurance coverage.
LED lights themselves do not produce heat. Their transformers however
do produce some heat, whether that be at an alternate location or built
into the light element it self.
The instructions that come with the LED lighting will indicate what is
LEDs themselves do produce heat, altho not very much. As
it happens, transformers also produce heat, altho not very
much. The two things that do produce enough heat to watch
for are the rectifier circuit (usually but not always in
with the transformer) and the current limiting resistor
(usually but not always in with the LED). Typically the
biggest heat source is the resistor.
I will say that the ribbon LEDs that I have used produce no noticeable
amount of heat at the LED itself. We in fact never turn our under cabinet
ribbon LEDs off and there is no heat build up at all.
Given that, a roll of ribbon LEDs on the reel will heat up pretty quickly
but once unwound and laid out flat there is no noticeable amount of heat,
In fact our LED strings of Christmas lights that I also leave plunged in
all season 24/7 never get warm either.
On Sunday, May 8, 2016 at 9:09:09 PM UTC-7, Leon wrote:
Your finger is a good heatsink, but a poor sensor. The LEDs produce more heat
than light, and there are other components (resistors, one per three LEDs,
typically on strip lights) that dissipate power, too.
One watt of light is about what a 2 inch magnifier collects on a sunny day;
that would get your finger very toasty, even if there weren't ANY waste heat.
Leon I have burned myself on LEDs, granted I was repairing a problem
but they do get warm it is a function of how much current is flowing.
But the transformer is the main heat sources and what ever resistive
element is use to create current.
LED lights produce a lot of heat. The problem is the LED itself is very
sensitive to heat and this heat from the LED is essentially a point
source. Much work with heat sink design goes into removing this heat.
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