19 Feb
2015
19 Feb
'15
4:48 p.m.
Cere probably is thinking of the warmth of standard incandescent lights with a color temp
of 2700K.
A light with 4000K color temperature is a cool white, good for detail work, not so nice
for comfort...
For more info on color temperature in lighting for the layman:
http://www.topbulb.com/color-temperature/
-- Glenn (theater lighting designer)
On Monday, February 16, 2015 12:49 AM, Patrik D'haeseleer <patrikd(a)gmail.com>
wrote:
The one in the lab room is 4000K, with a Color Rendering Index of 82. That is
"warmer" than fluorescents (and zero flicker!), and much warmer than a daylight
bulb. Good for doing detailed work - which is exactly what we need there - and acceptable
for working with colors.
If we want mood lighting, we should get mood lighting. If we want lights to do soldering
or other precision work, 4000K is great. Heck get both, so people can pick and choose what
they need at any time. Plus a few >5000K, >90CRI daylight bulbs for people doing
artwork.
Patrik
On Sun, Feb 15, 2015 at 12:18 PM, Cere Misc <cere.misc(a)gmail.com> wrote:
As another point of reference for the lights that Patrik got for the lab room. They are
ugly cold sanitarium colored lights. Please lets NOT get more of those!
On Sun, Feb 15, 2015 at 11:03 AM, Patrik D'haeseleer <patrikd(a)gmail.com> wrote:
As another point of comparison, the LED light fixture I put in the CCL lab room is this
one:
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http://www.homedepot.com/p/Lithonia-Lighting-2-ft-x-4-ft-White-LED-Prismati…
It's a 4000 Lumens, 45 Watt fixture made to resemble a fluorescent tube one.
Internally, it has four 36-LED strips behind a nice diffuser, and a big-ass 30VDC/1.58A
LED driver. (In comparison, that first bulb Jake posted is 800 Lumen, so this one is
equivalent in light output to about five of those)
These sell for $119 at Home Depot, which is of course far too much. Should be easy to
reverse engineer these for far less, but I'm not sure how well that would go over with
our fire inspection, even if some of the chinese knockoffs may very well pose more of fire
hazard...
Patrik
On Sun, Feb 15, 2015 at 1:17 AM, Jake <jake(a)spaz.org> wrote:
so i guess sudoroom (and CCL too probably) need some new lights, since the flourescents
are failing.
Home Despot sells 11-watt "warm white" bulbs for $9 each, which would be a good
idea if we had regular lamp sockets to screw bulbs into...
http://www.homedepot.com/p/Cree-60W-Equivalent-Daylight-5000K-A19-Dimmable-…
but china can always do better. I looked on Ali Express and sorted by customer
satisfaction, looking for LED lighting in "downlights" which suggests lamps
shining downward?
these look good but the seller rating is only 97.4%:
http://www.aliexpress.com/item/High-Quality-Aluminum-9W-15W-21W-27W-45W-LED…
they seem to be "16 to 21" watts for $6.95 including shipping. They offer
"warm" and "cold" flavors so we could just get a mix of the two kinds,
for something in the middle when they're all on.
here is the search i was doing:
http://www.aliexpress.com/category/200002289/led-downlights.html?site=glo&a…
this one is also a good price, and the seller rating is higher (98.1%)
http://www.aliexpress.com/item/21W-Antifogging-Epistar-led-downlight-AC85-2…
ultimately i have higher confidence in the quality of something we buy from Cree at Home
Despot, but I think we should give China a chance and buy a few of the "16 to 21
watt" ones and see how they compare.
For reference, Cree (a reputable company) and other LED bulbs sold at Home Despot are
called "60 watt replacement" bulbs while actually using 9 to 11 watts. The
light fixtures presently in Sudoroom and CCL each have two 75-watt flourescent bulbs, for
a total of 900 watts of light in the bocce ball room when they're all working.
That suggests that 150 watts of LED lighting would be equivalent, which would cost about
$60 from the first aliexpress link i provided.
These lights just have wires coming out, so we would perhaps attach them onto the metal
structures that are presently holding flourescent lights for simplicity, until we come up
with something better.
-jake
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