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Old 08-27-2009, 11:36 PM   #1
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Can light turns off and on


I have one can light in my house that when its on for maybe 30 mins it will cycle on and off every 10 mins or so. Where should I be looking here? Does it sound like a loose wire or do can lights have some sort of electronics that could be going bad. They are all within 1-2 years old from what I know.

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Old 08-27-2009, 11:41 PM   #2
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Can light turns off and on


You have either too much wattage light bulb in there, or a bad heat sensor.

Try using a CFL bulb and see if that makes and difference.

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Old 08-28-2009, 06:44 AM   #3
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Can light turns off and on


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You have either too much wattage light bulb in there, or a bad heat sensor.
Or there is insulation over a non-IC can.
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Old 08-28-2009, 07:05 AM   #4
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Can light turns off and on


What the others said, but to answer the question, there are heat sensors in recessed light fixtures. If they get too hot the sensors open up like circuit breakers. When they cool down, they close again. So yes, they can cylce on/off. Too big(watts) bulb, wrong type fixture(non IC rated) and covered with insulation, bad sensor, as suggested above.

Where insulation is installed above the fixture, you need an IC(insulation contact) rated fixture. Even better is an airtight. And inside each fixture, there should be a sticker that tells the max. size bulb allowed depending on the trim ring installed. Not all trim rings allow the same wattage bulb.
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Old 08-28-2009, 12:47 PM   #5
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Can light turns off and on


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Or there is insulation over a non-IC can.
I thought a non-IC can had no protection (thermal cut off) and would just burn up or start a fire?
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Old 08-28-2009, 01:06 PM   #6
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Can light turns off and on


I've had 2 bathroom fan/light combos that had the thermal cut-off installed
They were both rated for a 100w light, but if you didn't have the fan running it would overheat & the light would go off/on
I've never had a can overheat & turn off & on
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Old 08-28-2009, 03:32 PM   #7
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Can light turns off and on


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I thought a non-IC can had no protection (thermal cut off) and would just burn up or start a fire?
No, no, no.

All modern cans have thermal cut-outs. I've been in the trade over 20 years and I have never install one with out it.

Lamp cycling is a tell-tale symptom of insulation over a non-IC can.
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Old 08-29-2009, 06:49 PM   #8
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Can light turns off and on


Go buy a 15 watt light bulb replacing the exiting one, if it starts to cycle,
three things, using the wrong shape bulb, and using bulb in higher wattages then the MFG. of this product allows, third, the luminaire, has a cook sensors.

I would pull out the trim, see if you can find what this thing is I.C. or non-I.C.
And if non-IC, reach in and moved the isualation away from it.


Remember the sensor protect the light, the breaker protects the wire
feeding the light.

Last edited by Ranger31; 08-30-2009 at 12:58 PM. Reason: to correct spelling errors
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Old 08-30-2009, 12:40 PM   #9
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Can light turns off and on


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Originally Posted by Speedy Petey View Post
No, no, no.

All modern cans have thermal cut-outs. I've been in the trade over 20 years and I have never install one with out it.

Lamp cycling is a tell-tale symptom of insulation over a non-IC can.
Agree. What makes an IC rated can different from a non-IC rated can, if they both have thermal cut offs?.......Thanks
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Old 08-30-2009, 06:05 PM   #10
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Can light turns off and on


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Agree. What makes an IC rated can different from a non-IC rated can, if they both have thermal cut offs?.......Thanks
IC cans have a different socket setup and the socket is usually not adjustable. This is for Halo type cans.

What's funny is Lightolier Lightening cans are the same, IC or non. What makes the differences is the trim and installation.
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Old 09-03-2009, 12:05 AM   #11
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Can light turns off and on


I check the rating and its 65w and thats what I have in it. I wouldnt be surprised if there was insulation on top of it heating it up though. The last owner pushed the insulation all over in the attic when he put them in to the point that there are some places with none at all. I'll check into it once the so-cal summer heat subsides.

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Old 09-03-2009, 01:22 PM   #12
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Can light turns off and on


Quote:
Originally Posted by Speedy Petey View Post
IC cans have a different socket setup and the socket is usually not adjustable. This is for Halo type cans.

What's funny is Lightolier Lightening cans are the same, IC or non. What makes the differences is the trim and installation.
Thanks. I guess it's just a labeling thing as both (IC & Non IC) are thermally protected?

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