16 Feb
2015
16 Feb
'15
11:39 a.m.
There is something missing this the specs of that lighting. It is not warm
at all. I don't think it's fair (or appreciated) to oversimplify the need
for warm lighting as "mood" lighting. The "color" of the lighting
has
nothing to do with light intensity values and it's easy to spot when you
see it. The eyes are much more sensitive than instruments when it comes to
these supposed specifications of "warmth".
If you go to a lighting store you can just see what they look like and buy
accordingly. Maybe Ikea or Home Depot have a light viewing section so we
can just see for ourselves.
On Mon, Feb 16, 2015 at 12:46 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-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-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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