[sudo-discuss] lighting options

Wed Mar 4 11:35:54 PST 2015

My favorite online electronics discount store Electronic Goldmine is having
a special on some nice LED strips. They are doing an unusual 1-day sale
with a limited number available per customer. I already ordered my limit,
so if we want more of these, we should have a couple different people
ordering more ASAP.

I think the main strips of interest are these:

http://www.goldmine-elec-products.com/prodinfo.asp?number=G20119

They are 14-LED 21.75" long AcuityBrands strips with a mix of "warm" and
"cold" white LEDs, totaling 10W (40V x 0.25A). That's the same brand as the
LED strips that are in the LED fixture in the CCL lab room, so should be
decent quality. Four of these should be about the same length and light
output as one of the 8ft T12 fluorescent bulbs, so we could just attach
them to the existing light fixtures.

They are $4 a piece with a limit or 5 per customer. A bit more expensive
than the Chinese LED spot lights that Jake ordered, but a strip light would
provide more even illumination to work by. They may or may not be better
quality: known US brand vs chinese supplier, but the ones Electric Goldmine
sells were presumably stripped out of some existing equipment.

They also have a sale on some strong 12-LED 15.25" long RGB LED strip
lights made by Konami Gaming. No hookup info, but they are selling them
dirt cheap: $5 for a package of five! (Limit 2 packages of 5 per customer)

http://www.goldmine-elec-products.com/prodinfo.asp?number=G20109A

Patrik

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=5yc1vZc7buZ1z115g2
>
> 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-AC85-265V-
>> 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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>>
>
>
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