[time-nuts] 100 watt & higher LED power supply...

[Tom Knox]

Hi Paul;
I started thinking about this project because we are installing a new EMC room at work and thought we could use totally eliminate lighting as a noise source with LED lighting. Allowing lighting during even the most precise measurements. While researching I ran across some amazing items on eBay out of China.
I was talking about these raw chip arrays in which a 100watts means it consumes 100watts like 400-800watt in conventional incandescent light. The LED's are also more directional so in a number of applications the seem Lumen output may produce more LUX where needed. Light Temp is another big deal. In all these products their claimed ratings and actual ratings can very different. I prefer actual wattage since it seems the most accurate rating, but it took some time to understand the different efficiencies between product type. I will most likely go with a larger number of lower wattage arrays, and mix and match color temp to taste. My ultimate goal is to greatly improve my current lighting to make up for my aging eyes while at the same time lower lab noise. I also hope the increased efficiency will help with temperature stability around the lab while saving energy. Last, I was hoping to do it for about the price of replacement bulbs in my current lighting.

Thomas Knox



> Date: Tue, 18 Sep 2012 09:47:23 -0400
> From: paulswedb at gmail.com
> To: time-nuts at febo.com
> Subject: Re: [time-nuts] 100 watt & higher LED power supply...
> 
> Boy I have been staying clear of this discussion.
> Pretty sure they make drop in led tubes now at $$$
> Its funny we speak to a 100 watt lamp. But for a led that would be
> something like 24 watts.
> It makes no sense to speak in watts. Instead Lumens. I think we want the
> luminisity of a 100 watt incandescent bulb.
> Was in a hotel elevator last week that had replaced the overhead lamps with
> 4 chip LEDs. Both the intensity and color were very impressive. I was
> thinking great for the bench. Wanted to unscrew one and see who made them.
> It was the small form factor like Halogen.
> Regards
> Paul
> WB8TSL
> 
> On Tue, Sep 18, 2012 at 8:56 AM, Michael Baker <mpb45 at clanbaker.org> wrote:
> 
> > Time-Nutters--
> >
> > OK-- So flicker would be objectionable running off a
> > rectified 110VAC line.    My thinking was to find
> > a way around needing a current limiter that would
> > waste energy as heat.   Rectifying (and some filtering)
> > of the 110AC line seemed to be one approach.
> >
> >  I am thinking of building a several hundred watt LED
> > light for over my workbench by mounting the LEDs on
> > an existing frame for a 4-lamp (long-tube) fluorescent lamp
> > fixture and using the large surface area of the metal
> > frame as a heat sink.
> >
> > The 100 watt LEDS are on eBay but I have not seen
> > the current-limiting drivers for them on eBay.
> >
> > Mike Baker
> > ------------------------
> >
> >
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