is a ring light that is places around the quill. My ring light was
sourced from a camping/outdoor furniture store. It originally ran on 6
volts (several AA) and now is powered by a computer power supply.
Regardless of which way you go I feel the light at the quill is a
project everyone should undertake. It improved the safety of the mill as
the light is where you need it and no shadows on the workpiece.
Cheers and seasons greetings from Melbourne.
Andrew
On Sun, 2011-12-25 at 05:42 +0000, g_liming wrote:
>
> Hello all,
>
> Back a while ago there was some discussion about LED lighting, and I
> built a ring light for my mill using a 39 LED 120 mm ring I bought on
> Ebay for $6. I was pretty happy with the way it looked, but I also
> took some measurements.
>
> Using a 12V supply, I turned it on and measured a current draw of
> 200ma, well within the capability of the small wall wart I am using.
> Placing a light meter on the table of the mill and positioning the
> bottom of the ring 12 inches away, I measured the light intensity to
> be 546 lux with no other ambient light. This LED light does not get
> warm, it is almost impervious to flying chips, and provides a very
> even light without shadow. I don't know what the wavelength or black
> body temperature of it is, but it is pretty close to a cool white, not
> like some of the bluish ones I've seen that are called "white."
>
> For comparison's sake, I took the same meter and placed it on the top
> of my drill press table, which uses one of those magnetic base task
> lights like
> http://www.harborfreight.com/75-watt-magnetic-base-light-90766.html I
> positioned the light source 12 inches from the bottom of the bulb to
> the meter, also with no other ambient light. A regular household
> white incandescent 40 watt bulb was 420 lux, a 60 watt was 912, and a
> 100 watt bulb was 1740. Therefore, I believe the LED ring light is
> roughly the same as a 50 watt bulb. Seeing as how I use a 60 watt
> bulb in it normally (A 100 is just too hot to work around) I am pretty
> happy with the LED ring. I suppose you could use this 120mm ring with
> another 180mm ring outside it and the combination would provide a 100
> watt equivalent LED light if you felt you needed it. (The light meter
> I am using has a total error of accuracy of +/- 4% and an error in
> repeatability of +/- 2% with a resolution of 1 lux in the range I was
> in.)
>
> Just for fun, I also measured a couple of CFLs. A 13 watt CFL
> (advertised as a 60 watt equivalent) turns on at 340 lux, but within 4
> minutes settles down at 936 lux. A 26 watt CFL (advertised as a 100
> watt equivalent) turns on to a measly 194 lux, but in 4 minutes is
> giving out 1290 lux, still a fair bit away from a incandescent 100
> watt bulb.
>
> Just thought I would share that data. :) Happy Holidays,
>
>
>
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