On Sun, 20 Nov 2016 19:42:24 -0600, Leon lcb11211@swbelldotnet
wrote:

On 11/20/2016 5:11 PM, krw wrote:
On Sun, 20 Nov 2016 15:10:07 -0600, Leon lcb11211@swbelldotnet
wrote:

On 11/20/2016 10:02 AM, Brewster wrote:
On 11/19/16 9:35 PM, Leon wrote:



I cab pinch the ribbon LED beteen my thumb and my finger. Nothing. We
leace these lamps on in our kitchen 24/7 and there is not heat what so
ever.

I use a lot of these LED strips in lighting projects, never need any
heat sinks.

Specifically the typical LED used in strips is the "3528" surface mount
device. 4 to 8 Lumens at 0.06 to 0.08 Watts of power. Even the "high
density" strips with 600 of these parts (over 16') dissipates less than
50 Watts. Higher power LEDs (5050s) are only 1/4 Watt each.
It is when you get into the arrays (more common in point source
lights/bulbs) that dissipate 12+ Watts that the heat is palpable (it'll
burn your finger, DAMHIK), Physically they are a "blob" about 3/4"
diameter, mounted on a 1" sq. aluminum plate which is thermally bonded
to whatever heat sink the bulb has.

-BR



Understood but the point I am trying to make is that not all LED
lighting gets hot. I have single bulbs that get hot at the base and
some at best get ever so slightly warm after touching for several
seconds. All of the cool ones are attached to a wood product and stay
on for hundreds/thousands of hours at one time. I get more warmth from
my LCD computer display screen.

No, all get hot. How hot is the difference between ones that will
last and ones that won't. Note that "not that hot" may be enough to
burn a finger (100C or above), if you could touch it.


I going to agree that hot is relative. My LED's don't get much more
than room temperature.

Again, the surface may not be much more than room temperature but the
surface temperature of the fixture isn't important to the LEDs
reliability.