New light fixture giving me trouble

Other Devices & Integrations Lighting & Load Control
1

I installed this large ceiling light that has many LED lights built into it, it is super bright and needs to be on a dimmer.

I used a Cooper rf9540 (specifically led compatible) like I have done with other LEDs but in this case it completely freaks out the light fixture, the lights are unstable at almost all dimmer range settings, there is a very, very narrow band that works and if I dim it at all, it destabilizes LEDs elsewhere in the house on the same circuit.

Any thoughts on a dimmer that might work? Don’t need a three way in this case.

Below is what the light fixture instructions says…
What is a forward phase dimmer is that like a mlv or elv dimmer? That I should be using instead?

The fixture is designed to dim with a standard Triac forward phase dimmer. Dimming levels will vary by dimmer.
Below is a list of recommended dimmers:
Lutron MACL-153M Lutron DVL-153P Lutron SCL-153P Leviton IPL06-10Z Leviton 6674-POW
Due to inrush current wattage should not exceed 150 watts of product for a 600 watt dimmer.

Warning!This fixture is supplied with an installed LED driver. These fixtures are dimmable using standard triac dimmer.For best operation we recommend using Lutron CL DimmerS.

2

You can learn about forward(leading edge) and reverse(trailing edge) phase cut dimmers here.

All of the Electronic Low Voltage(ELV) dimmers that I know of are trailing edge(reverse) phase cut and will not work for your application.

Most Magnetic Low Voltage(MLV) dimmers are, so far as I know, forward(leading edge) phase cut. For this reason, I think that the Leviton VRMX1-1LZ 1000W Vizia RF ZWave Universal Magnetic Low Voltage Dimmer or the Leviton DZMX1-1LZ Decora Z-Wave Controls Scene Capable Universal Dimmer(lacks Instant Status) should work for your application. However, I would recommend contacting Leviton and asking them to be sure.

3

Yes, that is what I suspected, it was the word Triac, that was throwing me off. I will give a MLV version a shot and see how it goes.

4

Most z-wave dimmers are leading edge I believe. Qubino are advertising trailing edge.

Anyways if all else fails maybe you could rewire the lamp with new drivers?

5

It is a huge ceiling fixture (5’ diameter) and pricey with tons of LEDs in it, I had to have it professionally installed because of the size/awkwardness of the thing… no way am I pulling it down and trying to mess with the internals :slight_smile: Worse comes to worse I will just put a non-z-wave dimmer in there. I only use the z-wave to ensure it is turned off at night for this particular application.

I know the z-wave dimmer I have in there isn’t bad because it was working with the old light fixture, but I am going to try one of the non-z-wave dimmers they recommend as I happen to have a few Luton CL dimmers arround to test with. Maybe it is wired wrong or there is something wrong with the fixture itself.