Please see supporting web album:
Improved LED Downlights at Home Depot .
I ponder my role as a self-appointed reporter. Obligation to be a responsible observer is negated by manufacturer action to offer improvements, and sometimes a degraded product, with no announcement. For T67, or for T47 , nothing on new packaging or at homedepot.com, informs the buyer of changes made. A reporter is needed when products are discontinued without explanation, as with wonderful and not-glaring Nicor DLS10 .
("New" was December, 2012, very long ago in the evolution of LED lighting.)
This post will present portions of a Picasa Web Albums review of Home Depot's new T67 LED Disk Light, Manufactured by CREE, and packaged as Commercial Electric.
This is the promised replacement of T91 LED plate lights. There is a distinction between plate and disk, as developed in the previous post . The Commercial Electric and Lighting Science Group packaging of T91/ Glimpse lights nowhere uses the word disk. I hope Glimpse packaging will adopt the label plate LED.
The T67 disk light loses about 10% efficiency in presenting the diode phosphors within a cone above the ceiling plane. The light is thrown away for style and with misunderstanding. The volume of the diffuser cone could be employed to reduce the space in a junction box demanded by the power block.
Home Depot is again offering only one color temperature, this time 2700°K. I hope they will reconsider, and will offer instead a 3000°K product, or a hybrid where LED phosphors are of a sampling of colors, For now the block over the diodes will interfere with some found lighting junction boxes, where most boxes unfortunately, and perhaps needlessly, include posts for 2 3/4" oc light fixtures. Boxes knocked out of service are the good family of fiberglass boxes, by Allied Moulding. My preference is for RACO 175 steel boxes, with only the 3 1/2" oc screw positions, which work fine.
Home Depot and CREE have put good thought into bug-proof simplified mounting.
I continue to develop my own experiments in comparative rating of brightness of LEDs and other light forms. Here in Google Docs is my latest effort, now including T67 lights. To view this, please download, and study on your own computer. Google Docs does a poor job of rendering. I now project lights indoors against a 4' square of drywall. The drywall has a satin finish application of very bright white paint, and yet photos capture general brown tones. I don't think brown tones are reflected from the OSB divider, as colors don't change much when a white towel is draped over the divider. The study is subjective, but I think it is consistent in comparisons, especially where two lights have the same color temperature. Whatever the flaws or naivete of my effort, it is better than accepting package lumens claims as statement of relative ability to produce useful illumination.
Here is the comparison of T67 and T91 brightness and color:
Employing Brightness Numbers I advocate.
By lumens ratio, the T91 should be brighter by 15%. I call the difference 25%. If the T91 is B6.7, the T67 is B5. B5 is equivalence to a 125 watt incandescent light. It is interesting that the T67 package makes no statement of incandescent equivalence.
Here is the comparison of a new Philips more-efficient "100w" incandescent bulb, with the T67:
If T67 is B5, and the incandescent is B4, the T67 should be judged 25% brighter here.
Here is a fresh comparison of that 100w incandescent bulb, with T91:
If T91 is B6.7, and the incandescent is B4, the T91 should be judged 67% brighter here.
Unbearable Buzz With T67 On Dimmer
At 12/28 I add a very important forgotten observation. There is a loud hum, from the T67 luminaire, when connected to any dimmer. The direct observation is with two of the most-useful dimmers, Cooper Wiring Devices D106P, and Lutron C-L Dimmer, CTL-153PDH.This alone renders the T67 unacceptable in its initial form. I'm sure CREE will find a way to fix this. LSGC did an excellent job of ridding Glimpse lights of a hum or buzz some complained against, also in the luminaire. I found that hum barely discernible, and acceptable; but was glad to see it gone. I would not tolerate the hum now with T67 lights.
Readers, please comment. I think there are very important shifts of concept here. Powerful consensus will speed action to bring suitable lights to contractors, where we might eliminate all future installation of can lights, and pursue a strong weatherization campaign to eliminate existing attic-floor can lights. For now, only the 6" Glimpse is ready for deployment in this campaign.
At 1/19/2013, add note: Find further review in post LED Lighting In RACO 175 Junction Boxes. Also, follow all discussion of LED plate lights by label selection .
At 2/23/2013 add observation of dimming with many LED disk lights in parallel. A 600 watt dimmer will control more lights than you would ever want at one switch, easily forty. The T67s come on instantly. Tests are reported in comparison to T91 lights, at this new post.
No More T91's
At 1/27/2013, add another note: Although the T67 is an unacceptable alternative to T91, Home Depot has ceased entirely to offer the T91 online. The listing at homedepot.com reports this today as Out Of Stock Online. Telephone inquiry reveals the status is in fact inactive, synonymous with discontinued. I'm not surprised. It can not be profitable to continue to assemble this product in Commercial Electric boxes, for very small sales volume. A diligent shopper might yet buy from Home Depot in Lighting Science Group packaging as product Glimpse, 4" or 6", by in-store special ordering .
New in 2014
At 1-24-2014, add link to additional T67 review, along with a new LED disk light from Cooper Industries, now sold at Home Depot. The review is:
Please note this review finds a family of new lights no better than T67/ T47, with about-same brightness whether 4" or 6", and with the same old hum/ buzz, whatever you call it. Maddening. Home Depot learned nothing from criticism of T67/ T47, here.
Response to Commenter JoeBreeves, 2/15/2014:
You suggest buzz might be controlled with Leviton 6615-P0W Electronic Low Voltage dimmer.
Several reviewers at homedepot.com report success against buzzing, in using Electronic Low Voltage dimmers, so, maybe this works.
This dimmer may be purchased for competitive $31.97 at Amazon, but I don't wish to buy and try it. I don't like emphasis of the slider in this dimmer, preferring big on/ off toggle. Such nicer ELV dimmers typically cost more than $70.
A better luminaire such as Sylvania 70732 is a better choice, getting better efficiency and no buzzing, with ordinary dimmers.