[sudo-discuss] lighting options

Thu Feb 19 19:38:40 PST 2015

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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