<div dir="ltr">Yep. It's that whole warm black body radiation thing...</div><div class="gmail_extra"><br><div class="gmail_quote">On Thu, Feb 19, 2015 at 7:38 PM, Jake <span dir="ltr"><<a href="mailto:jake@spaz.org" target="_blank">jake@spaz.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">halogens are very inefficient, 2nd only to plain old ordinary bulbs.<div class="HOEnZb"><div class="h5"><br>
<br>
On Thu, 19 Feb 2015, Cere Misc wrote:<br>
<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Actually my favorite "warm" lighting is halogens. Didn't bother to look at the specs but that combined with a<br>
little more whitish light would probably be ideal for sudo/ccl. Again. I think the light would be a lot more<br>
pleasant, whatever we choose, if it's projected to the ceiling and bouncing back down.<br>
<br>
On Thu, Feb 19, 2015 at 4:48 PM, Glenn Meader <<a href="mailto:glenn@chromakinetics.com" target="_blank">glenn@chromakinetics.com</a>> wrote:<br>
Cere probably is thinking of the warmth of standard incandescent lights with a color temp<br>
of 2700K. <br>
A light with 4000K color temperature is a cool white, good for detail work, not so nice for comfort...<br>
For more info on color temperature in lighting for the layman: <a href="http://www.topbulb.com/color-temperature/" target="_blank">http://www.topbulb.com/color-<u></u>temperature/</a><br>
-- Glenn (theater lighting designer)<br>
<br>
<br>
On Monday, February 16, 2015 12:49 AM, Patrik D'haeseleer <<a href="mailto:patrikd@gmail.com" target="_blank">patrikd@gmail.com</a>> wrote:<br>
<br>
<br>
The one in the lab room is 4000K, with a Color Rendering Index of 82. That is "warmer" than fluorescents<br>
(and zero flicker!), and much warmer than a daylight bulb. Good for doing detailed work - which is<br>
exactly what we need there - and acceptable for working with colors.<br>
If we want mood lighting, we should get mood lighting. If we want lights to do soldering or other<br>
precision work, 4000K is great. Heck get both, so people can pick and choose what they need at any time.<br>
Plus a few >5000K, >90CRI daylight bulbs for people doing artwork.<br>
<br>
Patrik<br>
<br>
On Sun, Feb 15, 2015 at 12:18 PM, Cere Misc <<a href="mailto:cere.misc@gmail.com" target="_blank">cere.misc@gmail.com</a>> wrote:<br>
As another point of reference for the lights that Patrik got for the lab room. They are<br>
ugly cold sanitarium colored lights. Please lets NOT get more of those!<br>
<br>
On Sun, Feb 15, 2015 at 11:03 AM, Patrik D'haeseleer <<a href="mailto:patrikd@gmail.com" target="_blank">patrikd@gmail.com</a>> wrote:<br>
As another point of comparison, the LED light fixture I put in the CCL lab room is<br>
this one:<br>
<a href="http://www.homedepot.com/p/Lithonia-Lighting-2-ft-x-4-ft-White-LED-Prismatic-Lens-Troffer-2GTL4/203820958?N=5" target="_blank">http://www.homedepot.com/p/<u></u>Lithonia-Lighting-2-ft-x-4-ft-<u></u>White-LED-Prismatic-Lens-<u></u>Troffer-2GTL4/203820958?N=5</a><br>
yc1vZc7buZ1z115g2<br>
<br>
It's a 4000 Lumens, 45 Watt fixture made to resemble a fluorescent tube one. Internally, it<br>
has four 36-LED strips behind a nice diffuser, and a big-ass 30VDC/1.58A LED driver. (In<br>
comparison, that first bulb Jake posted is 800 Lumen, so this one is equivalent in light<br>
output to about five of those)<br>
<br>
These sell for $119 at Home Depot, which is of course far too much. Should be easy to<br>
reverse engineer these for far less, but I'm not sure how well that would go over with our<br>
fire inspection, even if some of the chinese knockoffs may very well pose more of fire<br>
hazard...<br>
<br>
Patrik<br>
<br>
On Sun, Feb 15, 2015 at 1:17 AM, Jake <<a href="mailto:jake@spaz.org" target="_blank">jake@spaz.org</a>> wrote:<br>
so i guess sudoroom (and CCL too probably) need some new lights, since the<br>
flourescents are failing.<br>
<br>
Home Despot sells 11-watt "warm white" bulbs for $9 each, which would be a good<br>
idea if we had regular lamp sockets to screw bulbs into...<br>
<a href="http://www.homedepot.com/p/Cree-60W-Equivalent-Daylight-5000K-A19-Dimmable-LED-Light-Bulb-with-4Flow-Filament" target="_blank">http://www.homedepot.com/p/<u></u>Cree-60W-Equivalent-Daylight-<u></u>5000K-A19-Dimmable-LED-Light-<u></u>Bulb-with-4Flow-Filament</a><br>
-Design-BA19-08050OMF-12DE26-<u></u>3U100/205597079?N=5yc1vZbm79<br>
<br>
but china can always do better. I looked on Ali Express and sorted by customer<br>
satisfaction, looking for LED lighting in "downlights" which suggests lamps<br>
shining downward?<br>
<br>
these look good but the seller rating is only 97.4%:<br>
<a href="http://www.aliexpress.com/item/High-Quality-Aluminum-9W-15W-21W-27W-45W-LED-Downlight-Ceiling-lights-lamp-AC8" target="_blank">http://www.aliexpress.com/<u></u>item/High-Quality-Aluminum-9W-<u></u>15W-21W-27W-45W-LED-Downlight-<u></u>Ceiling-lights-lamp-AC8</a><br>
5-265V-With/<a href="tel:2027740342" value="+12027740342" target="_blank">2027740342</a>.html<br>
<br>
they seem to be "16 to 21" watts for $6.95 including shipping. They offer<br>
"warm" and "cold" flavors so we could just get a mix of the two kinds, for<br>
something in the middle when they're all on.<br>
<br>
here is the search i was doing:<br>
<br>
<a href="http://www.aliexpress.com/category/200002289/led-downlights.html?site=glo&isrefine=y&shipCountry=US&SortType=" target="_blank">http://www.aliexpress.com/<u></u>category/200002289/led-<u></u>downlights.html?site=glo&<u></u>isrefine=y&shipCountry=US&<u></u>SortType=</a><br>
total_weight_score_desc<br>
<br>
this one is also a good price, and the seller rating is higher (98.1%)<br>
<a href="http://www.aliexpress.com/item/21W-Antifogging-Epistar-led-downlight-AC85-265V-Contains-the-drive-power-free-" target="_blank">http://www.aliexpress.com/<u></u>item/21W-Antifogging-Epistar-<u></u>led-downlight-AC85-265V-<u></u>Contains-the-drive-power-free-</a><br>
shipping/<a href="tel:2047334906" value="+12047334906" target="_blank">2047334906</a>.html<br>
<br>
ultimately i have higher confidence in the quality of something we buy from Cree<br>
at Home Despot, but I think we should give China a chance and buy a few of the<br>
"16 to 21 watt" ones and see how they compare.<br>
<br>
For reference, Cree (a reputable company) and other LED bulbs sold at Home<br>
Despot are called "60 watt replacement" bulbs while actually using 9 to 11<br>
watts. The light fixtures presently in Sudoroom and CCL each have two 75-watt<br>
flourescent bulbs, for a total of 900 watts of light in the bocce ball room when<br>
they're all working.<br>
<br>
That suggests that 150 watts of LED lighting would be equivalent, which would<br>
cost about $60 from the first aliexpress link i provided.<br>
<br>
These lights just have wires coming out, so we would perhaps attach them onto<br>
the metal structures that are presently holding flourescent lights for<br>
simplicity, until we come up with something better.<br>
<br>
-jake<br>
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