[sudo-discuss] lighting options
Cere Misc
cere.misc at gmail.com
Thu Feb 19 20:02:07 PST 2015
Yep. It's that whole warm black body radiation thing...
On Thu, Feb 19, 2015 at 7:38 PM, Jake <jake at spaz.org> wrote:
> halogens are very inefficient, 2nd only to plain old ordinary bulbs.
>
>
> On Thu, 19 Feb 2015, Cere Misc wrote:
>
> Actually my favorite "warm" lighting is halogens. Didn't bother to look
>> at the specs but that combined with a
>> little more whitish light would probably be ideal for sudo/ccl. Again.
>> I think the light would be a lot more
>> pleasant, whatever we choose, if it's projected to the ceiling and
>> bouncing back down.
>>
>> On Thu, Feb 19, 2015 at 4:48 PM, Glenn Meader <glenn at chromakinetics.com>
>> wrote:
>> 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 at 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 at 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 at gmail.com>
>> wrote:
>> As another point of comparison, the LED light fixture I put in the
>> CCL lab room is
>> this one:
>> http://www.homedepot.com/p/Lithonia-Lighting-2-ft-x-4-ft-
>> White-LED-Prismatic-Lens-Troffer-2GTL4/203820958?N=5
>> yc1vZc7buZ1z115g2
>>
>> 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 at 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-LED-Light-Bulb-with-4Flow-Filament
>> -Design-BA19-08050OMF-12DE26-3U100/205597079?N=5yc1vZbm79
>>
>> 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-Downlight-Ceiling-lights-lamp-AC8
>> 5-265V-With/2027740342.html
>>
>> 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&isrefine=y&shipCountry=US&SortType=
>> total_weight_score_desc
>>
>> 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-AC85-265V-Contains-the-drive-power-free-
>> shipping/2047334906.html
>>
>> 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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