19 Feb
2015
19 Feb
'15
8:02 p.m.
Yep. It's that whole warm black body radiation thing...
On Thu, Feb 19, 2015 at 7:38 PM, Jake <jake(a)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(a)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(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:
> 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(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-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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