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Author Topic: Halogen bulb temperatures  (Read 2475 times)

bkenobi

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Halogen bulb temperatures
« on: August 31, 2016, 09:50:27 AM »

I have a garage door opener that indicates the maximum bulb wattage is 75W. At some point I apparently put a 100 bulb in by mistake. When it burned out and I went to replace it, I could see significant plastic melting marks suggesting the mfg was serious about that bulb requirement.

I would like to increase the bulb light output and was thinking an alternate technology might work. I know CFL won't physically fit as the ballast is too bulky. I could try LED, but was thinking one of those halogen incandescent hybrid bulbs might work well for much less money. It won't be on long enough to ever pay off LED though that's the next option.

My concern is with temperature. If those halogen hybrid bulbs are at 72W for the 100 equivalent, does anyone know if the heat output would be closer to that of a 72W or 100W incandescent? I've seen tube halogen bulbs used in ovens so I know they can get hot. But then the easy bake oven used an incandescent bulb.

bkenobi

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Re: Halogen bulb temperatures
« Reply #1 on: August 31, 2016, 11:32:27 AM »

I found one thread that asks the exact same question for the same reason.

http://boards.straightdope.com/sdmb/showthread.php?t=755212

Unfortunately, no one posted a link to any source data and it's all conjecture.  They suggest that a 43W halogen is equivalent to a 60W incandescent because the package said so.  Not quite the real answer since the mfg is only looking at the lumen output and not heat.

Another link looks at temperature of the bulb but does not include halogen.  It also doesn't really compare one bulb to a comparable replacement (matching lumens between types).

https://sewelldirect.com/learning-center/led-vs-incandescent-light-bulbs

« Last Edit: August 31, 2016, 11:49:30 AM by bkenobi »
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dhouston

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bkenobi

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Re: Halogen bulb temperatures
« Reply #3 on: August 31, 2016, 12:15:36 PM »

I saw that one too.  It gives temps for some bulbs but doesn't list lumens to know if they are comparable to another.  Also, they don't include the A19 halogen bulbs which I'm particularly interested in.  I'm sure the inner halogen tube is much hotter, but is the outer glass as hot?  Also, since most of the heat is radiation does it even matter since whatever is rejected in heat will heat whatever surface is close (plastic plate in this case).

Brian H

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Re: Halogen bulb temperatures
« Reply #4 on: August 31, 2016, 01:19:26 PM »

As you indicated. Not all 72 watt Halogen replacements are the same Lumens as the incandescent it replaces.
Even the incandescent bulbs. Vary by manufacturer and bulb model

Few in my cabinet.

Halogen:
Smart Living Supermarket brand:
72 watt: 1270 Lumens, color temperature 2800K, A19 Shell
Sylvania Super Saver:
72 watt: 1490 Lumens, color temperature ?, A17 Shell
Satco S2404:
72 watt: 1490 Lumens, color temperature 2900K, A19 Clear Shell
Satco S2404:
72 watt: 1490 Lumens, color temperature 2900K, A19 Frosted Shell
Satco S2407 75 watt equivalent.
53 watt: 1050 Lumens, color temperature 2900K, A19 Frosted Shell

Incandescent:
GE reveal 100:
100 watt 1250 Lumens A19 Shell
Smart Living:
100 watt 1690 Lumens A19 Shell
Sylvania
75 watt 1180 Lumens A19 Shell

LED:
Feit 100 watt equivalent:
13 watt, 1500 Lumens, color temperature 3000K, A19 shell
Feit 60 watt equivalent:
9.8 watt, 800 Lumens, color temperature 3000K, A19 Shell
Feit 40 watt equivalent:
6.3 watt, 450 Lumens, color temperature 3000K, A19 Shell
« Last Edit: August 31, 2016, 03:26:02 PM by Brian H »
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bkenobi

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Re: Halogen bulb temperatures
« Reply #5 on: August 31, 2016, 06:06:25 PM »

And I would probably look for the highest lumen bulb, but the main issue is temperature. I have a couple installed by my front door and standard incandescents around the corner. I'll shoot them with my ir thermometer tonight.

Brian H

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Re: Halogen bulb temperatures
« Reply #6 on: September 01, 2016, 06:03:13 AM »

Reading the running temperature would help in your choices.
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bkenobi

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Re: Halogen bulb temperatures
« Reply #7 on: September 01, 2016, 09:21:19 AM »

Running tenp? Never seen that before.

JeffVolp

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Re: Halogen bulb temperatures
« Reply #8 on: September 01, 2016, 09:29:46 AM »

Doesn't it just come down to watts - light output = heating?  Wikipedia lists luminous efficiency of a 60W incandescent bulb at 2.1%, and a glass halogen at 2.3%.  So the heating should be similar.  Choosing a bulb with higher light output for the same wattage should result in less heating in an enclosed space, but the change would be insignificant compared with the total wattage consumed.

Jeff
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bkenobi

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Re: Halogen bulb temperatures
« Reply #9 on: September 01, 2016, 09:46:13 AM »

It does, but after thinking about it last night it's not a simple question of  ulb wattage vs temperature. I a 500w halogen bulb (shop lamp) were in open air of 70f and a 23w CFL were in a perfectly insulated box, which is hotter?  Without running numbers, the CFL should be hotter since there is no way for heat to escape and over time more is continually dumped in. That scenario should make for an extremely hot enclosure eventually. The halogen is in the open with a heat sink (ambient air) and radiates all heat away.

I used my ir thermometer with the 100W bulbs last night
 There was very little difference in temp. These were installed in brass and glass fixtures and the peak temp was 122f and 116f for incandescent and halogen respectively. I then measured the temp of the 75W  bulb in the door opener...155f. That bulb was in a similar small enclosure but surrounded by black plastic and frosted plastic.

This is too complex for conjecture and I'll just ask the mfg if they have a recommendation.

Brian H

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Re: Halogen bulb temperatures
« Reply #10 on: September 01, 2016, 11:24:44 AM »

Running temperature may have been a poor choice of words.
How hot they got would be a better description.
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