With these lights, and with six T67s in addition, I am able to expand understanding of how LED disk/ plate lights behave when operated on a dimmer.
Here is a video of the operation of sixteen LED disk lights in parallel, controlled by one Cooper Wiring Devices D106P dimmer, Sixteen In Parallel.MP4
Here is a back-side comparison of original and current T91/ 6" Glimpse lights:
Here are some conclusions from this testing:
- The number of lights that may be operated from one dimmer is limited by the wattage rating of the dimmer. A 600 watt dimmer can operate forty 15 watt luminaires, carrying five amps.
- The original T91/ Glimpse with two clunky power blocks is unacceptable on a dimmer, if there is more than one light. If you buy via the ebay link and intend to dim, demand newer version in communication with the seller. I think I got as many of the older version, as the seller thought I might tolerate.
- One of the six older T91s failed in minutes of testing, never to fire again. This is the second failure of this kind I have seen. This is another reason to refuse buying the older version. I doubt I have recourse now, with the seller. I will want to break apart and examine one of the failed lights. I wish failures and fixes were freely discussed by manufacturers and their major distributors.
- I had claimed the newer T91/ Glimpse has been cured of humming in a dimmer circuit. Not so! I have just never been able to hear the hum from any distance.
- Seven T67s I have tested now on dimmers, have identical and objectionable hum, in a dimmer circuit. It isn't a simple problem. LSGC did not in fact find a cure for Glimpse. Some smart person could figure out why the Glimpse lights make less noise. It may be a subtlety of mounting provisions and structure natural frequencies, vs. the AC power at 60 Hz.
I suggest there has been only one change of the 6" Glimpse/ T91 design. Please see my post, where I comment on visible differences. I call the two versions 6A and 6B.