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#210551 - 07/08/13 06:18 PM exploding bulbs
schenimann Offline
Member

Registered: 02/18/08
Posts: 194
Loc: Western North Carolina
I've got a customer that I installed 60-70 4" rework cans for. Some of these are eyeballs. They have had a few bulbs "blow up". They have put in a few of the 60watt par 16 bulbs. I think that these are the ones that have been a problem. They are the only bulbs that fit in the Juno eyeballs. I think they exceed the rating of the can and trim. Would this extra heat cause this to happen to the bulbs?

They are trying to maximize the light output for the cans. Any suggestions?

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#210554 - 07/08/13 10:01 PM Re: exploding bulbs [Re: schenimann]
Lostazhell Offline
Member

Registered: 02/21/04
Posts: 1248
Loc: Bakersfield, CA (Originally Or...
I've heard of lamps burning out prematurely, but exploding?? confused Huh.... Are there momentary voltage spikes or moments when other loads are off where the voltage could be going high?

Have you tried 130V. lamps? or CFL style par 16's?

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#210556 - 07/08/13 11:16 PM Re: exploding bulbs [Re: schenimann]
BigB Offline
Member

Registered: 03/31/04
Posts: 725
Loc: Tucson, AZ USA
Originally Posted By: schenimann

They are trying to maximize the light output for the cans. Any suggestions?


Yes, LEDs.

I have seen lamps explode when there was a loose/flakey neutral condition. Once is was a 60 watt A-19 in a pendant, the other time it was a G base halogen in a wall sconce. When the halogen exploded it sounded like a gunshot and took out the protective cover as well. The wall sconce had a neutral wire literally falling out of the wirenut. This was on my own house.

Is there plenty of free air space around those 4" cans? As far as I know there is not an IC rated 4" remodel can made.


Edited by BigB (07/08/13 11:18 PM)

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#210557 - 07/09/13 06:16 AM Re: exploding bulbs [Re: schenimann]
Texas_Ranger Offline
Member

Registered: 12/17/01
Posts: 2331
Loc: Vienna, Austria
In Europe line voltage halogens have a reputation for blowing up in a spectacular fashion and are required to have a protective cover.

In areas with a rather low line impedance (i.e. close to a beefy transformer) incandescent bulbs also tend do die with a loud bang but usually don't explode. Sometimes the glass falls off though (probably putty failure). Apparently older high-quality bulbs used to have a fuse inside the "stem" and new ones don't, so if they fail and there's an arc flash between the ends of the broken filament there's a sustained arc at a rather high current, which usually trips the breaker.

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#210560 - 07/09/13 02:53 PM Re: exploding bulbs [Re: schenimann]
geoff in UK Offline
Member

Registered: 12/30/02
Posts: 169
Loc: UK
Yes, place I work bought some cheap GLSs which had no fuse and used to fail explosively. I've also seen mains halogens which can blow out the protective glass screen, sending a near red hot disc of glass, or shards thereof, onto the lucky person below. The lesson in both cases is don't buy cheap rubbish!

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#210561 - 07/09/13 07:02 PM Re: exploding bulbs [Re: schenimann]
schenimann Offline
Member

Registered: 02/18/08
Posts: 194
Loc: Western North Carolina
They have put in some of the par16s with the porcelain necks. I know these are rated to high for the cans. I don't think they are having problems with the correct 45 watt bulbs. What is the heat output of a comparable "60 watt" LED bulb?

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#210562 - 07/09/13 07:31 PM Re: exploding bulbs [Re: schenimann]
HotLine1 Offline

Member

Registered: 04/03/02
Posts: 6786
Loc: Brick, NJ USA
The best source of LED heat 'output' would be from the lamp mfg data sheets. A Google search of the mfg will take you there.

FWIW in my days of servicing a national chain, we had a few PAR/Halogen/HR lamps that 'blew'. IMHO, I just called it defective lamps.


Edited by HotLine1 (07/09/13 07:35 PM)
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#210567 - 07/10/13 09:22 AM Re: exploding bulbs [Re: schenimann]
Texas_Ranger Offline
Member

Registered: 12/17/01
Posts: 2331
Loc: Vienna, Austria
In my experience 60W equivalent LEDs tend to be 6-9 W.

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#210575 - 07/10/13 08:48 PM Re: exploding bulbs [Re: schenimann]
HotLine1 Offline

Member

Registered: 04/03/02
Posts: 6786
Loc: Brick, NJ USA
Tex:
Are you saying that the heat is only 6-9 watts??
I see a lot of LED lamps that have IMHO large heatsinks??
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#210578 - 07/11/13 09:04 AM Re: exploding bulbs [Re: HotLine1]
Texas_Ranger Offline
Member

Registered: 12/17/01
Posts: 2331
Loc: Vienna, Austria
At least that's what the label says! I guess I'll have to rig a TRMS amp meter to one and check. I don't think actual power consumption is that much higher than rated power though, although of course the power supply losses likely aren't included in the label rating (same with compact fluorescents, at least so I was told).

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