Houzz Logo Print

Cree CR6 flicker-NOT on a dimmer

10 years ago

Hi all,
I am hoping to find out why I have had so much trouble with my Cree CR6 LED's. Way back in in the beginning of my kitchen remodel I lurked a lot on this forum to figure out what I wanted in lighting. I knew that I didn't want a yellowish light on my bright white cabinets, so I orders a few different temps from Polar Ray, 3000K, 3500K, and 4000K. This are the actual Cree product that is 625l, GU24 base as I'm in CA. I decided on the middle one as fitting my needs. So my contractor ordered the rest of what I needed from my local electrical distributor for the entire ground floor as well as stairway and upstairs hallway. I did actually see the boxes of lights when they came in and they were the right thing.
I repositioned the ones I had bought from Polar Ray in other areas such as laundry that weren't getting remodeled.
Well, before the big order came in I was experiencing substantial flicker on all three of my Cree lights. I sent them back to Polar Ray and they assured me that this was highly unusual for actual Cree lights, especially as they were not on dimmers! They were kind enough to exchange them for all 3500K since that was the color I had chosen.
Well I thought that resolved it but now I have had several more start to flicker and my contractor seems unwilling to get to the root of the problem. Some of them are in areas that have a dimmer and some are not. We talked extensively about the dimmers and he knows the difference between the ones for incandescent and LED. However, I did not see the boxes for these. He is of the mindset that these lights are not what they are cracked up to be and wants to put in Ecosmarts from HD at 2700K so he can be done with it. I am heartbroken because I feel that I researched so much about all the little aspects of the remodel and these were supposed to be the best money can buy.
The other problem is since this is the third time I have had him come out for flickering and as a result the lights have been rearranged and I no longer know which ones were the ones from Polar Ray and quick ones were from the local shop. He temporarily put in Ecosmarts so I wouldn't have to deal with the flickering or a empty hole and he repositioned them to be al in one room.
He is coming out to trouble shoot next week but I am not too confident in a resolution that does not involve a trip to big orange.
What could the possible reasons be, and what should I do? Also, assuming the problem is something he can fix and the lights are not bad, is there any reduction in lifespan or quality of the light that has been subjected to a lot of flickering? Or should I insist they all be replaced to new anyway?
Thanks so much!

Comments (28)

  • 10 years ago

    I thought the Ecosmarts fixtures were CREE CR6s...

    Anyway, do they flicker in unison? I had a problem with the Ecosmart BR40s (Lighting Science 15watt) flickering in unison. When I say in unison, our family room has two circuits, and only the bulbs on the same circuit would flicker in unison.

    I replaced the Lutron Skylark dimmer switch with one of the new Lutrons designed to work the LEDs and the flicker went away.

    Although you mentioned that you do not have a dimmer on all of your bulbs, if they do flicker in unison, it might be worth experimenting with a LED dimmer.

  • 10 years ago

    The flicker could be caused by fluctuations (noise) in the AC input voltage. This needs to be checked by your electrician.

  • Related Discussions

    Cree CR6 and LR4?


    Comments (4)
    Iam still new at this and found this old thread in my searching and learning but the reason you would go with the LR4 despite its minimally smaller size is that they are available in 15 and 30 degree beam spreads which is more desireable in places like over countertops with upper cabinets above. Less glare off cabs, more light concentrated where you are actually are using it. The bulb is recessed deeper which makes the kitchen look better from a different room. I wish Cree made CR4s with smaller beam spreads and/or wish the LR4s had a 3000 option.
    ...See More

    cree cr6


    Comments (14)
    @robj - Thanks for posting that. It is good to hear that they are holding up well so far. After buying other bulbs (incandescent, halogen and CFL) that died prematurely, I was certainly hesitant to spend the extra money on these. We ended up changing out all of the recessed cans on our main floor (11 in all). They do put out more light than the incandescent bulbs that we had been using, which is a nice bonus for us, as we hate dimly lit rooms.
    ...See More

    Is the Cree CR6 safe to use over a shower?


    Comments (7)
    If you decide against LED can, my second preference in shower area is fluorescent. I know, I know..BUT there is twice the light output with fluorescent because it doesn't get as hot as incandescent. I used a can rated for up to 32 watts because you can go as low as 24 watt and as high as 32 watt. For the trim, a "regressed, frosted lense" will give you a nice, soft glow similar to a flood lamp, but I strongly recommend a good quality fluorescent lamp (Sylvania) at 3000 Kelvin. Juno is the only manufacturer that has a regressed trim that will work with a 32 watt.(32 watt lamp is longer than 24 watt so if you decide you are ok with 24 watt, there are more manufacturers available.) I've installed this configuration right next to a can with incandescent flood (in kitchen) and no one could tell the difference in both color and look between the fluorescent and the incandescent.
    ...See More

    Cree CR6?


    Comments (14)
    triphase, I think you and David are saying the same thing. You said to put cans 12-20" from the cabinets or crown moulding. David is saying to put cans 29"-36" from the WALL. Assuming 12" uppers with 4" crown moulding, this equates to approx 16" of depth. 16" + your recommendation of 12" - 20" from the crown is the same as 28" - 36" from the wall as what David was saying. However, I do agree that measurements should be based on off the cabinet door face or crown, since some people may have deeper uppers and may or may not have crown moulding. Or given both ways, since the rough in would be measured off the adjacent walls. I will be posting my plan by this weekend so look forward to your and David's lighting layout recommendations.
    ...See More
  • 10 years ago

    Thanks mattpete and davidtay,

    The lights definitely do not flicker in unison, and some of the worst offenders are not on a dimmer. Where I do have dimmers, I have the Lutron diva dimmers, which are compatible.

    Mattpete, the ecosmart brand belongs to HD, and is made using some Cree brand parts, but is not an entire Cree product. They are only offered in a select range, which is what led me to look at other manufacturers for the color light that I wanted.(35k)

    Davidtay, I'm not sure what the AC voltage input is. We put in all new wiring with new dedicated circuits. Do you mean our power source from the city? Would that affect other areas of the house if that is the problem? We've lived here for 10 yrs and had no issues with builder grade everything.

    The main thing I am struggling with is that I really wanted a specific temp for the house and if these won't work for whatever reason, I am back to square one. Should I persevere and push on, or is there a better option for me?


  • 10 years ago

    AC input - 120V AC +/- 5V.
    It depends on how things were wired up. For example when several circuits share the same ground wire, there may be variations in the ground potential (i.e. sporadically non zero) seen on other circuits due to the current draw on one circuit.

    Other noise sources include motors, ...

    In the end, it would be advisable to have your electrician go through the wiring and confirm whether it is due to electrical noise on the wiring or not.

    LEDs and CFLs are more visibly affected by electrical noise than incandescent lighting.

  • 10 years ago

    I have had three CR6s that have started flickering after a few months. Interestingly the three bad ones were the 5000K version - of eight purchased. Since I bought them at Home Depot, I just exchanged them for new ones - no questions asked. The 22 or so 2700K CR6s have all been fine.

  • 10 years ago

    Not sure if this will help you specifically, but it might put things in perspective.

    When I put in 5 dimmable LEDs (Satco S8947) in my kitchen to replace builder's incandescents, I decided I wanted 2 more drops created and I wanted to put them on a dimmer. So I had the electrician create two more drops and install a dimmer. I had purchased a Lutron LED-compatible dimmer in advance of electrician coming out. But as soon as he connected the dimmer, the lights went haywire. He had a standard dimmer in his truck and that worked fine, so he left it connected. But then I had to go buy 2 more LED's for the 2 new drops. When I installed them, I got flickering (several bulbs randomly). I tried just putting 1 LED in and that was OK. I thought one LED might be bad so I brought it back and exchanged it. Put it in and got flicker again. Took one out and still got flicker. Swapped where the 7th non-LED was and flicker stopped. So, bottom line my dimmer is right on the cusp of being able to handle 5 bulbs, sometimes 6 depending on location. Crazy!!!

    The lighting supply house said this is not uncommon and directed me to the SATCO website where there is a list of several compatible dimmers. He also recommended a dimmer that they sell. But the logistics of hit or miss ordering and returning dimmers to find a compatible one and hiring the electrician for one or multiple visits, was not appealing to me. So I put an incandescent in the 7th hole that made the dimmer happy with the 6 LEDs. Luckily the colors are pretty close. And no one but me should know that one is not an LED. Who looks up at LED lights?

    Oh, another thing I learned was that if the switch for the LEDs is sharing a box with another switch (mine is) that will negatively affect the situation too.

  • 10 years ago

    Electrical noise can cause the lights to flicker. For instance, if 2 circuits share the same ground, there could be momentary spikes.

    The proper way to diagnose this is to see what the waveform looks like on a oscilloscope.

    Possible solutions, assuming that electrical noise is the cause

    You'd have to engage with Cree support and your electrician.

  • 10 years ago

    "Dimmers show compatibility(Lutron diva)"

    Compatibility with what? Have you consulted the bulb list for Lutron Diva switches? Are the flickering bulbs on the list?

  • 10 years ago

    Thanks davidtay,

    Wow that's really technical so I may have to read it a few times.(lol). Of course it could be just the thing so I won't dismiss it.

    Thanks rococogurl,

    The original lights in question are all true Cree cr6 625lumens gu24 base 35k color. I have verified with Lutron and Cree that the products I have are compatible with each other.

    It still does not explain the flicker in the lights at the top of my stairs which is on NO dimmer and a completely different circuit than the dimmed ones in the kitchen. Those were, in fact, the first ones to start. Thank goodness I don't use the steps much at night so I just leave them off all the time.

    I have made contact with a rep from Cree and will work through their troubleshooting guide and update. Sounds like a fun(sarcasm) project for the hubs and I this weekend since my contractor is still unresponsive.

    Until then....

  • 10 years ago

    I have two Cree A19, daylight, 40 watt bulbs that black out from time to time. No dimmer switch. I replaced the switch with a new 20 amp switch. Same results as old switch.

    Nobody has an answer.

    So, I returned them for an identical exchange.

    Results are the same. Black outs and now flickering has been introduced to the scenario.

  • 10 years ago

    What did you use before the Cree bulb and did you observe issues like shortened life span, ... Before?

    I would expect that there is something amiss with your electrical wiring.

  • 10 years ago

    Thanks davidtay,

    Before the remodel, I had standard can lights with CFL bulbs, the kind that screw into the can as well as a flourescent light box. No dimmers at all. And no issues with longevity of lights prior to remodel.

    Existing wiring was all up to code and we could have left it but I specifically opted to run all new so we could separate out the circuits how we wanted(kitchen lights, family room lights, kitchen GFCI, standard plugs, each major appliance, etc)

    All these things were standard for my contractor. The only deviation from what he has done in all his other jobs is my specification for all Cree products rather than the Ecosmart from HD.

    I am going to get some Ecosmarts this weekend and work through the troubleshooting guide from the Cree tech. My plan is to replace a couple each dimmed/not dimmed. We'll see if that does anything or if they flicker as well. I will also see if I can deal with the 27k color.

  • 10 years ago

    First, I would return the bulb and get a sub. I had 3 of my "20 year" LED Par 30 floods just go dead after a few months. I think this technology is only 3/4 baked.

    Then, in the flickering continues I'd ask Lutron to replace that particular switch (may possibly be a wrong switch). To support that I'd make a video of what's happening and send it to their tech support people.

    If that doesn't do it, then either the bulb or switch needs to change to a different model. Cheaper to get a different compatible bulb, seems to me.

    IME so far -- I'm a designer who has a whole house of ceiling lights and dimmers, not a lighting engineer -- the bulbs are not reliable no matter what anyone says. I know everyone is high on the Cree (including my contractor). I've had fairly decent luck, on average, with most of the Utilitech bulbs (made by Feit) from Lowe's. Their house brand. Can't seem to find the Cree around here.

    Most contractors will be useless as they don't understand any of this. Our insulation contractor is green-certified and encouraged me to change out the bulbs. After I did that I discovered the old switch issue which he wasn't aware of. He is now.

    I'm thinking of changing out just a few key switches. I put an LED bulb in the single can above my sink and it works and it dims as it's a 1-way old switch but it also flickers.

  • 10 years ago

    My house is one year old.

    There's nothing wrong with the wiring.

  • 10 years ago

    Age of the house has no bearing on whether you'd get electrical noise.

    There are situations where a common ground wire is shared between different circuits. Or there could be electrical noise generated by attached appliances propagating to other circuits.

    You can try changing the bulbs to cfls or incandescent or some other led vendor. If the underlying cause is electrical noise, the replacements would not last very long.

  • 10 years ago

    The original bulbs were halogen and were original, so about a year old. I replaced them on purpose to reduce heat in the enclosed fixture and conserve energy.

    There are not any attached appliances to the lighting circuit.

    Last evening, the LED bulbs were on for several hours and did not black out. This morning, they blinked twice in 10 minutes. Strange behavior.

    Maybe it's my cat?

  • 9 years ago

    There is a design flaw in the CR6 that causes the flicker. A component is over stressed and fails. I have repaired several of them over the past year.

    If you are running without a dimmer and see flicker/shimmer then the light is defective.

  • 9 years ago

    I'm using Cree bulbs in two pendant fixtures in the living room, each on separate dimmers. One was flickering, changed the bulb. It flickers occasionally but I can get it to stop by adjusting the dimmer. I may switch them out for incandescent bulbs, even though they are warm white, they still have a hint of fluorescent look to me.

  • 9 years ago

    Buchu, how to get them repaired? I have CR6-800 lumen recessed lights. None of them flicker. But 2 of Cr6-625 lumen recessed LED lights flicker.

    Thank you very much.

  • 9 years ago

    None of my newly installed (in the recessed cans that were in stalled in December 2011) CREE 1500 lumens 3,000K temperature 47 degree radius PAR 38 bulbs flicker at all. They are on a switch with a sliding dimmer piece. I just bought the bulbs 2 weeks ago and I love them. I have 6 in my 10 X 14 kitchen and they put out wonderful light that is not burry. Sometimes at night I dim them if I am just going in to get a drink of water and I do not want too much light.

    So sorry about your bad experience.

  • 9 years ago

    My CR6s aren't flickering, but some of them have started to hum or buzz. They are not on a dimmer switch.

  • 9 years ago

    My kitchen with CREE CR6 - 8 lights on a circuit with a dimmer - one light just started pulsing. It doesn't go off, but while the remaining lights are clear and steady, this one goes high-low intensity with about a 3 second periodicity. I'm guessing its a bad light, and that the contractor should replace it. Your thoughts?

  • 9 years ago

    Here's an update for anyone who is having the same problems.

    I finally convinced my contractor back in May to assist in switching out all of the flickering Cree's, some of which were on a compatible dimmer, some on no dimmers. Turns out all I had to do was mention lodging a formal complaint. Of course, now that the lights have been replaced for a few months, I now have had two more start to flicker. And I have no idea if these are part of the original batch or first, second, or third replacements because when one flickers in the kitchen, I move it to the family room or elsewhere so I don't get the shakes while handling knives.

    This is so maddening! I will not contact my old contractor, and he wouldn't come anyway since the remodel has been done for more than one year. His foreman who did all the electrical has since left him and moved out of state due to the contractor's personality problems affecting the business. While he was still here, we spoke many times of the lights and went through what could be the problems other than the lights themselves. It is just the lights.

    I am truly disappointed in the so called longevity of these lights that they only last a few months before flickering. And it starts out so subtly that it is barely noticeable by my family, but of course, I am very sensitive to it and am checking the lights frequently.

    Now I am not sure whether to keep replacing one by one, or rip them all out and start fresh with all Ecosmarts or something else. I am having some problems with my new appliances as well, so I feel at times like the entire remodel is falling apart. Ack!

  • 9 years ago

    As I mentioned on this thread way back in Feb, I have had similar issues with the 5000K CR6. Several more have been replaced since then. I keep returning the failed ones to HD, and buying replacements. Am hoping that I am finally getting to a set of "good" ones.

    In contrast, my 2700K CR6 units have been flawless. Most are several years old now and get a lot of use.

    It is interesting to note that my failed 5000K units are _not_ on a dimmer. Whereas most of the 2700K _are_ on a dimmer. All wiring is new, so I typically measure a solid 124v.

  • 9 years ago

    My failing CR6 is 3000K. Electrician doesn't return our calls (and we still owe him money, so something odd is up). I also am concerned that a light fixture that is now on new wires (but pre-existing) seems much less bright. It was on an electronic dimmer previously which the electrician tossed and put a new one in - so annoying.

  • 7 years ago

    I just looked up online about cree lights flickering. I have lived in my current house (11,000 sq feet over3 floors) since 2014. The house is a very faithful colonial reproduction from 1980. My wife and I did a thorough redo of the electrics, mechanicals, Windows, new cedar roof and cedar siding (where needed), paint, bathrooms... We had the entire house rewired and had had about 150 recessed lights in the house (bedroom, kitchen, all bedrooms, all closets, sun room, pantry, halls, laundry room all basement rooms) Redone in Cree 2700k BR30 65 watt bulbs (from reputable electrician). I did this because our past house (3200 sq foot over 4 floor) had many rooms with similar recessed lights I converted to Cree led (the exact same) in 2012. The lights in the old house DID NOT flicker when lights were at full brightness, but the old dimmers were a problem. So I went to Lutron dimmers for CFL and LED. There were no more issues. Well, due to this experience, all lights in new house started up on these led comparable dimmers. I have to be honest - I am SUPER DISAPPOINTED with CREE. I have had at least 20-30 Cree flickering lights in my house. At first I thought it was the rooms, because certain rooms flickered all the time - but, those rooms had a ton of lights. I have replaced them with the LOWES equivalent and have not had an issue. My office (family owned) converted over as well and my parents did. And we all did Cree. We ALL had flicker issues. Some are so bad, they go off for a while! When we switched over to the Lowes brand (only on flickering lights), no more problem. The strange thing is that the Cree completely integrated low profile units (not screw in, but lower profile lights we needed in our pantry that look the same once installed, but are half the installed depth) have all been great. I am almost certain it's a quality control issue. People who have old incandescent "high watt" dimmers - realize you are replacing old bulbs with new ones that demand 1/6 or less the power. The old dimmers don't control the low load properly and you will get flicker if you dim lights. But if you have led ready dimmers or a solid switch, and lights flicker... It's the bulb. I've tried everything and it was the bulb. The Cree's are supposedly the best - but I have had a problem with at least 30. Replacing them fixed issue and other cree's in same circuit and switch have been fine for a couple years. If you have similar issues and a good dimmer - it is not you or your house. It is the light bulb. Return it. I think the Cree's made in the past had better quality control. I asked homeowners of my past house if they ever had to replace one (they are all from 2011/12 - all Cree) and they say they are great.

  • 7 years ago

    Interesting. I am getting ready to put new recessed lighting in (a remodel) and wasn't sure what the best option was these days. Back in 2010 when we remodeled out kitchen, the Cree lights (including the HD Ecosmart) were the highly rated, and we love the ones we put in! -

    But LED lighting has changed a bit since 2010, and I noticed that Polar Ray had on a few as closeouts so I called to ask for their recommendation - I got great help from them several years ago when I added a wet rated LED light inside my shower.

    What I was told was that the quality of Cree lights has gone downhill and they had thousands returned, so they are no longer going to carry them. They suggested their Sylvania or Halo lights instead.