Odd Heatsinks « on: July 14, 2016, 08:17:40 AM » Author: wattMaster
Big Heatsinks for a lamp, not LED, but this. Why are Heatsinks needed?
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	Re: Odd Heatsinks « Reply #1 on: July 14, 2016, 09:15:10 AM » Author: dor123
This is a highly loaded halogen lamp for projection application. These lamps requires forced cooling to prevent overheating. The heatsinks are probably auxiliary for the cooling fan of the projector.
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	Re: Odd Heatsinks « Reply #2 on: July 14, 2016, 09:16:32 AM » Author: wattMaster
Is my big 1000 Watt halogen lamp also highly loaded?
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	Re: Odd Heatsinks « Reply #3 on: July 14, 2016, 01:00:46 PM » Author: dor123
I think yes, as it is shorter than a regular 1000W double ended halogen lamps for general lighting, despite its filament is triple coiled. There are double ended halogen lamps in that wattage for special application that requires whiter light, and so highly loaded lamps.
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I"m don't speak English well, and rely on online translating to write in this site.
Please forgive me if my choice of my words looks like offensive, while that isn't my intention.

I only working with the international date format (dd.mm.yyyy).

I lives in Israel, which is a 220-240V, 50hz country.

	Re: Odd Heatsinks « Reply #4 on: July 14, 2016, 01:09:40 PM » Author: wattMaster
But I don't think it warrants forced-air cooling.
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	Re: Odd Heatsinks « Reply #5 on: July 14, 2016, 01:15:03 PM » Author: dor123
If the box don't says that forced cooling is required, so no.
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I"m don't speak English well, and rely on online translating to write in this site.
Please forgive me if my choice of my words looks like offensive, while that isn't my intention.

I only working with the international date format (dd.mm.yyyy).

I lives in Israel, which is a 220-240V, 50hz country.

	Re: Odd Heatsinks « Reply #6 on: July 14, 2016, 01:26:10 PM » Author: wattMaster
What's weird is that the box says to keep the bulb below X degrees F. (I can't remember.)
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	Re: Odd Heatsinks « Reply #7 on: July 15, 2016, 01:49:32 AM » Author: Medved
The need for either forced cooling or a heatsink is not about the absolute power (there were 50kW lamps needing none, as well as 100W lamps needed high speed air blow) You need extra cooling, once you pack high power into small space. Normally to maintain the bulb surface temperature, either water or forced air are used. But with a bit lower loading, the bulb material may be OK with that temperature, but it could be too much for the socket assembly. So very frequently the sockets do feature heat sinks just because the socket materials (and the wires) can not stand the temperature the biulb operates and in that equipment there is not possible for some reason to separate them by just a distance. Or the blowing air is capable to cool the thin bulb wall, but not anymore the complicated, bulky socket assembly, so the socket needs cooling by some other means.
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	Re: Odd Heatsinks « Reply #9 on: July 15, 2016, 11:36:01 AM » Author: Medved
Quote from: Ash on July 15, 2016, 08:48:42 AM Arent such assemblies simply made of high temp materials ? (Porcelain sockets, Porcelain tube sections isolated wire, ...) Just many metals alone have big troubles for a long term heat exposure: Copper above 200degC, steel above ~400degC, - mostly they start to oxidize. When you want to make a seal through e.g. quartz, you have very limited material choices (so the heat resistant alloys are not possible to use). Plus the flexible insulation is another problem - many materials are allowed to about 200degC or so. Normally the socket design is made so, the places where these wires are is not that hot anymore. But that requires distance. When you have no place for such spacing, you need to find other means to keep that end cold enough. And that is the use of a socket heat sink.
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	Re: Odd Heatsinks « Reply #11 on: July 20, 2016, 03:45:17 PM » Author: wattMaster
Quote from: toomanybulbs on July 15, 2016, 08:45:23 PM i suspect the heatsink is to keep the lead in seals at a safe temp.maybe to protect the socket too. My GE Bright Stik bulbs get very hot at the bases, so heatsinking would be helpful.
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