[RFI] Cree LED Light Bulb

[Charlie Gallo]

On 8/11/2014 Jim Brown wrote:

> On 8/11/2014 11:05 AM, Charlie Gallo wrote:
>> Again,  you're  looking  at  1.17  watts of light, and therefore 12.83
>> watts as heat

> All good analysis, quite sufficient as far as fire hazard is concerned.

Thank You

> But there's another issue -- that 13W of heat has to go somewhere, and
> depending on the enclosure, some or all may stay within the enclosure 
> and raises its ambient. That may, or may not, allow sufficient 
> conduction of heat away from the circuitry to prevent destructive 
> failure of the lamp and/or its circuitry.
Very  true  - BUT My assumption was that if you had an enclosure rated
for  60W  incandescent, AND a LED rated for enclosed fixtures, running
the  "60 watt equivalent" (or for that matter, a '75 watt equivalent')
in  the  fixture  is most likely NOT going to be an issue, in that for
all intents, watts drawn = heat


> Something like 5-6 years ago, I bought a couple of Edison-base multi-LED
> lamp assemblies from a hamfest vendor, and stuck them in a simple 
> reflector fixture (one-third spherical, thus 2/3 open) as lighting in 
> the shack. Within a month or two, both lamp assemblies had developed 
> cracks in the glass.

> 73, Jim K9YC




-- 
73 de KG2V - Charles Gallo
Quality Custom Machine-shop work for the radio amateur (sm)