[RFI] Cree LED Light Bulb

Roger (K8RI) k8ri at rogerhalstead.com
Mon Aug 11 01:27:56 EDT 2014

On 8/10/2014 8:55 PM, Kim Elmore wrote:
> We have a recessed can light in our shower. The tag inside states that 
> a 60 W incandescent in the max it can accomodate, but even a 60 W 
> reflector bulb has pretty wimpy output. I'd beenusing a 150 W 
> equivalent 42 W CFL, but they don't last long.

We have all CFLs through the house.  Excluding the garage (4 150W equiv) 
and basement (14 4' fluorescent tubes) , Out of  17, I've only had 2 
fail in the last 2.5 to 3 years.  I only have a single sub mounted CFL 
(in a can) over the shop entrance..  It's been on pretty much 24 X 7 X 
365 for a good 3 to 4 years.  The main lights in the shop are 22 full 
spectrum 75 Watt, 8' tubes and the electric use shows I spend a lot of 
time out here <:-))  .

None of the CFLs or tubes can be heard, AM broadcast through 440.

The "turn out the lights every time you leave the room" is a guarantee 
of a short life for a CFL, so the Many off/on cycles of a bathroom light 
would mean a short life although the newer ones are lasting longer.

LEDs are "expensive", but last a long time and use little power and 
"they should" get much cheaper over the next few years as production 
ramps up.


Roger (K8RI)

> Based on what I've seen here, I went to Home Depot and snagged a Cree 
> 75W equivalent (18 W consumption) flood light.  It is quite bright 
> and, as far as I can tell, RF-quiet at HF. I listened on on the AM BC 
> band and 160-10 m during the day (so 80 and 160 are quiet) and heard 
> nothing from it it. I also hear nothing from it on 2 m or 20 cm. So 
> far, so good!
> Kim N5OP

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