2007-03-09, 12:49 PM
I am in the process of replacing my DLP lamp-- lasted about 2 years.
Philips LCOS TV .
Does any one know what a typical resistance is for DLP lamps ?
You means resistance as in ohms? Well my projector uses 200w bulbs. Not sure what the voltage is ... why do you need to know this?
2007-03-10, 04:43 AM
An incandescent bulb would be measured for impedance, not resistance. As Jake said, what is the purpose of your question?
2007-03-10, 03:55 PM
An incandescent bulb would be measured for impedance, not resistance.
No it wouldn't. An incandescent bulb would not present any appreciable capacitance or inductance. It is a resistive load. Therefore, resistance is a proper measurement.
However, the resistance of an incandescent bulb varies with the amount of current passed through it. You can't use the resistance of a cold filament to calculate the wattage of the bulb. Measuring it with an ohmmeter is usually only useful as a comparison with other bulbs of the same type, to determine the probability of it being good.
That said, a DLP lamp is not incandescent. I believe it's a high pressure mercury vapor type. I don't know what kind of resistance or impedance one would have. I'm guessing a very high resistance until it arcs to emit light, and then a very low resistance.
One should use the appropriate (probably identical) bulb that was in the TV.
You state DLP and LCoS. It can only be one or the other. There seems to be a lot of confusion in your post.
Best to give us the exact model number of the TV and why you would want to know resistance, since not just any bulb will work, even if it had the correct resistance.