I just realized what you might be thinking of when you mention heat.
Inside an HID bulb, the arcing of electricity causes the gas around it to be at enormously high temperatures. Remember though, that heat and temperature are not the same things. While the temperature of the gas inside the bulb maybe be at very high temperatures, since there is so little gas, there isn't very much heat. Heat is a measure of energy contained due to high temperature. As such, heat is completely dependent on mass.
If you have an eye dropper full of 5 ml of 1000 degree water and drop the water into a 60 degree lake, nothing's going to happen. That's high temperature with not much heat. Similarly, if you took 100,000 gallons of 120 degree water, and dumped it into a 60 degree lake, odds are there would be some temperature/water current differences. That's an example of medium temperature, but much more heat.
So while operating temperatures inside an HID bulb are very high, since its heat is quite low, surrounding operating temperatures are also low, especially when compared to halogens bulbs.
Inside an HID bulb, the arcing of electricity causes the gas around it to be at enormously high temperatures. Remember though, that heat and temperature are not the same things. While the temperature of the gas inside the bulb maybe be at very high temperatures, since there is so little gas, there isn't very much heat. Heat is a measure of energy contained due to high temperature. As such, heat is completely dependent on mass.
If you have an eye dropper full of 5 ml of 1000 degree water and drop the water into a 60 degree lake, nothing's going to happen. That's high temperature with not much heat. Similarly, if you took 100,000 gallons of 120 degree water, and dumped it into a 60 degree lake, odds are there would be some temperature/water current differences. That's an example of medium temperature, but much more heat.
So while operating temperatures inside an HID bulb are very high, since its heat is quite low, surrounding operating temperatures are also low, especially when compared to halogens bulbs.
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