On 8/11/2014 EDWARDS, EDDIE J wrote:
The Watts drawn number is at the socket, so include that ballast.
That said, the electronics in said ballast are a LOT more sensitive to
heat than a light bulbs, which is why we discussed "fire" vs failure
> 2 things I haven't pinned down yet:
> What is the normal amount of heat generated by the ballast of CFLs?
> Is ballast heat included on the CFL wattage rating?
YES
> I have heard some CFLs have warnings they should not be used inside
> enclosed fixtures (open fixtures only), and others warn against
> using them mounted upside down. I assume this is due to ballast heat. But I
> could be wrong.
Yes again. You would have to look for a CFL that is rated for
enclosed use.
That said, I've entirely given up on CFLs. Hate the light, they have
never lasted worth a darn in the situations I've used them, take a
LONG time to warm up, and the final stroke - cost almost as much as a
LED light.
I've got 6 Cree bream warm white dimmable PAR-40 LED bulbs complete with trim
rings (aka meant for
can lights) running between the den and living room, and 8 PAR-30s
that DON'T include trim rings but are rated for cans/dimmable in the
LR and Den and Kitchen (the LR and den have a mix of each size - PAR40
for pure down, and PAR-30 in the eyeball lights). Had issues galore
with CFLs in the Den/LR (they were never in the kitchen), but I think
I've lost ONE LED in the last 3-4 years, and those lights are probably
on 8+ hours/day. I've never been able to detect a peep out of the
bulbs on RF
> 73, de ed -K0iL
> -----Original Message-----
> From: RFI [mailto:rfi-bounces@contesting.com] On Behalf Of Charlie Gallo
> Sent: Monday, August 11, 2014 1:05 PM
> To: Peter Laws
> Cc: rfi@contesting.com
> Subject: Re: [RFI] Cree LED Light Bulb
> On 8/11/2014 Peter Laws wrote:
>> On Mon, Aug 11, 2014 at 10:25 AM, Kim Elmore <cw_de_n5op@sbcglobal.net>
>> wrote:
>>> That's interesting as in their on-line FAQ, Cree says they approve of
>>> installation in can fixtures. We've had 42 W CFLs in there for the last 8
>>> years and never seen evidence of overheating. However, the light is cycled
>>> a lot and I suspect the failures we've seen are related to that. Cree again
>>> states that power cycling is harmless to their LED bulb. I guess I'll get
>>> to find out!
>> Lumens, gentlemen, please! IMHO, bulbs should also receive a rating
>> based on how much heat they generate. Clearly, there is a difference
>> in the heat output of an Edison bulb that consumes 60 W of power and a
>> CFL that puts out the equivalent light (at considerably less power
>> consumption).
> Actually, we know this:
> The TYPICAL 60 Watt soft white edison bulb generates 800 lumens. Now,
> if there was 100% luminous efficiency, you get 683 lm/W, so you are
> getting 1.17 watts of actual light, and 58.83 watts of heat
> The cree bulb I have sitting here, which claims 75 watt equivalent and
> 800 lumens..(Interesting, eh) draws 14 watts
> Again, you're looking at 1.17 watts of light, and therefore 12.83
> watts as heat
> Pretty much, if you think about any lightbulb, assuming it isn't
> giving off massive RF, or sound, anything not out the front as light
> is going to be heat
--
73 de KG2V - Charles Gallo
Quality Custom Machine-shop work for the radio amateur (sm)
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