Ever heard of 500 watts in a halogen bulb at 120 volts?

[slashmaster]

Have any of you guys heard of 500 watts with Halogen at 120 volts so your projectors not weighed down by a huge transformer? Looks like I might have got one for a czx-dab socket. if you've had this bulb, what's it like? How long does it last? Here's what I might have bought it's the 3rd pic. http://www.ebay.com/itm/161238454523?ss ... 1439.l2649

[bolextech]

Donsbulbs.com has this bulb rated at 25 hours.

Jean-Louis

[slashmaster]

Donsbulbs.com has this bulb rated at 25 hours.

Jean-Louis

Interesting, 2 completely different kinds of bulbs that last the same amount of time? Sounds like these companies really want you to pay if they can't make one that last longer than that.

[bolextech]

If you like DIY projects, you can extend bulb life significantly by installing a voltage dropping resistor or a rheostat in the lamp circuit. This will act like a dimmer and reduce light output a little and give you a warmer color. You can use an online dropping resistor calculator to figure out the specs. For example, to reduce lamp voltage by 10V requires a 2 ohm load rated a minimum of 50W. Using bigger is recommended; say 100W. A rheostat is even better as you can start the lamp at very low setting and increase the light gradually thereby avoiding the sudden jolt that is very hard on the lamp filament.

Jean-Louis

[slashmaster]

If you like DIY projects, you can extend bulb life significantly by installing a voltage dropping resistor or a rheostat in the lamp circuit. This will act like a dimmer and reduce light output a little and give you a warmer color. You can use an online dropping resistor calculator to figure out the specs. For example, to reduce lamp voltage by 10V requires a 2 ohm load rated a minimum of 50W. Using bigger is recommended; say 100W. A rheostat is even better as you can start the lamp at very low setting and increase the light gradually thereby avoiding the sudden jolt that is very hard on the lamp filament.

Jean-Louis

Thanks Jean!

Wouldn't want to drop the voltage at all for actually watching the films. Wouldn't want to mutilate this projector adding a hole for a rheostat either. But I realize some bone stock projectors keep the bulb lit at a very dim level while the fan idles so that like you said, they don't give as much of a jolt when you turn the bulb on like you were talking about. I want to add a resistor similar to what those projectors have.