lve dimmers for cree cr6 led lights?

regfmanMay 7, 2010

I am not clear on the concept: The CREE CR6 LED light fixtures can plug directly into AC 120V line voltage like an incandescent fixture does. I want to put them on dimmers instead of a simple switch. The electrical distributor where I bought the light has told me that from his experience most of the electrical contractors use the Lutron DIVA DVELV-300P for this CREE light.

CREE publishes a list of recommended dimmers.

[I'm having a hard time finding the URL to post but you can find the pdf with a web search for "recommended dimmers for CREE"]

I notice the DVELV-300P is not on the CREE list. I have called CREE and the customer support person is only qualified to tell me that the DVELV-300P is not on the list. I have asked her if she knows 1) if it has been tested and been found to not be acceptable or 2) whether it simply has not yet been tested? She does not know so she has forwarded me to someone named Ken but he hasn't responded to messages left on his voicemail. (I'm a little frustrated by that lack of customer support)

A friend of mine says that he has tried magnetic (not electronic) low voltage with the CREE and it flickered.

Two questions:

- how does a low voltage dimmer work with line level? I don't understand the concept. Isn't the dimmer before the voltage step down?

- does anyone have experience with the DVELV-300P ?

Thank you for reporting this comment. Undo
Thank you for reporting this comment. Undo

The term "low voltage dimmer" describes a dimmer used to control a low voltage load but the dimmer itself is line voltage. Magnetic transformer low voltage loads require a special design to eliminate the small amounts of DC voltage created by regular dimmers. This costs extra to put in the dimmer so most don't include it standard. Without this the transformer can overheat. Both dimmer and transformer can be damaged. Electronic transformers don't like the way a standard dimmer or magnetic low voltage dimmer chops the power at the leading edge of the sine wave and require reverse phase dimming instead which cuts power at the trailing edge. Many LED fixtures use electronic drivers that require electronic low voltage dimmers. There are many ways to drive and dim LED lighting and they must be compatible or premature failures will occur.

Here is a link that might be useful: Lutron's list of compatible LED fixtures.

    Bookmark   May 7, 2010 at 9:30PM
Thank you for reporting this comment. Undo

Thanks guys for the links. From the links I still see that the particular low voltage dimmer that the electrical distributor says he sells a lot of for that light are not on the recommended list. As mentioned I wonder if they have been analyzed by CREE and failed or whether they just haven't been tested yet. I guess I can take my chances and hook up one of them and see if it works but if it is going to cause premature failure of the LED I won't know for a while. If it causes noticeable acoustic noise that would be No Go.

Have you guys used the CREE lights and if so what dimmer do you use?

    Bookmark   May 7, 2010 at 10:08PM
Thank you for reporting this comment. Undo

I use Leviton Monet with my LR6.

    Bookmark   May 7, 2010 at 10:25PM
Thank you for reporting this comment. Undo

Looking at CREE's list of recommended dimmers I see that there is not a Leviton Monet listed. If you are happy with it - no acoustic noise, no flickering, decent range of dimming - that sort of confirms my suspicion that the CREE list is incomplete.
As I search for Leviton Monet I am learning that there are a lot of different models in that line. Do you recall what the model number is?

    Bookmark   May 8, 2010 at 5:53AM
Thank you for reporting this comment. Undo


From the Cree list of suitable dimmers

*The presence of a dimmer on this chart is not a guaranty or warranty of the compatibility of the LR6, LR4 or LR5 product families in any particular installation. The absence of a dimmer from this chart does not necessarily imply incompatibility. Please reference the dimmer manufacturer's instructions for installation and further product information.

I don't recall the model numbers.

No buzzing.

The Monet is really more suited for commercial applications (lots of lighting). Min load is 60W.

Lutron may have more choices/ be more suitable than Leviton.

    Bookmark   May 8, 2010 at 10:16AM
Thank you for reporting this comment. Undo


The Cree lights work with normal incandescent dimmers.


    Bookmark   May 8, 2010 at 2:22PM
Thank you for reporting this comment. Undo

I know the dimmer that I currently have that is left over from the incandescent cans makes noise - actually it was a few weeks ago that the electrician tried it and I can't remember whether the light was making noise or the dimmer. I think the noise was coming from the dimmer. We decided it would be best to get an appropriate dimmer.

I think the thing that I will take away from this discussion is what you pointed out about the absence of the dimmer from the CREE dimmer list does not mean the dimmer doesn't work, combined with the fact that the electrical supply store in San Francisco where probably a lot of greenies buy, recommends the DVELV-300P. I'll give it a try.

    Bookmark   May 8, 2010 at 7:06PM
Thank you for reporting this comment. Undo


If you check the types of dimmers on the CREE dimmer list, most are for incandescent loads and there are a few (Lutron) that can be used with Magnetic (inductive) low voltage loads.

Not to say that you shouldn't give it a try.

    Bookmark   May 8, 2010 at 11:40PM
Thank you for reporting this comment. Undo

I have three circuits in my condo using LR6s. Two use two fixtures each, and one uses three.

I have done tons of research on this issue, speaking to both Lutron and Cree customer service and eventually Cree application engineering.

I have been assured that dimming will lengthen, not shorten the life of the LR6s.

My understanding is that the potential failure mode of using Maestros with LR6s is flicker at some dimming levels.
I understand that flicker might occur if there is significant high-frequency electrical noise in the environment. 60-Hz noise like from motors in a fridge will not cause flicker, but old fluorescent ballasts might.

I have all new wiring in my home in MC, and my fluorescent ballasts are new Philips Advance DALI digital control.

I have decided to take the risk and am installing Maestro dimmers on these three LR6 circuits next week. I will report on my success.

    Bookmark   May 23, 2010 at 1:36AM
Thank you for reporting this comment. Undo

@pauldavisseattle - how did the maestro dimmers work out? i'm buying some soon and have looked at those and the leviton illumatech ipi06 for my cree lr6s

if you get this anytime soon, let us if you're happy with the maestros.

    Bookmark   December 10, 2010 at 4:09PM
Sign Up to comment
More Discussions
Let's brainstorm all about lighting and scene controls
Hi everyone, Let's face it, understanding lighting...
Buzzing LEDs
I'm exploring LEDs for a new build, and so far, not...
Rosette on slanted dining room ceiling?
Moved into a resale which has a dining room fixture...
Barb P
Entry light for awkward design
What should we do for a light at the front door? It...
Recessed Lighting Layout for Kitchen
Hi, everyone. I know this is asked all the time, but...
Sponsored Products
Burnished Bronze Four-Light Bar Light
$22.60 | Bellacor
Raindrop Narrow Zig Zag Double Gourd Table Lamp
Lamps Plus
Neo-Industrial Satin Nickel 9 x 24.5-Inch Three Light Vanity Fixture
$139.90 | Bellacor
Progress Lighting 8 in. Pro-Optic Compact Fluorescent Recessed Housing P8226-DVE
$90.00 | Home Depot
Kichler Pacific Edge Transitional Ceiling Fan
Cuboid Wood Base with Cuboid Shade Table Lamp
ELK Lighting 73030-2 Avalon Wall Sconce - 7W in. Silver - 73030-2
$146.00 | Hayneedle
Feiss Gianna Mocha Crystal Wall Sconce
Lamps Plus
People viewed this after searching for:
© 2015 Houzz Inc. Houzz® The new way to design your home™