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I see where most of the projectors on here are using 400 watt bulbs. I few are using 1000 watt bulbs. I wondered why the big wattage disperity. So I started looking around at bulbs and I see that most metal halide bulbs are 400 watts or 1000 watts with very few in between. I have also seen 450 watt and 500 watt ballasts.
So here's the question. Are there any suitable bulbs in the range between 400 watts and 1000 watts?
I have heard a little bit on here about over driving lamps. Can the LL lamp or other lamps commonly used for projectors be over driven? If so by how much? Would you use a 450 watt or a 500 watt ballast to do this? Does the LL electronic ballast over drive the bulb? If so by how much?
LL lab sells two bulbs. What are the advantages of the two? There's a big price difference in the two, but they both are still cheap enough that I don't think the cost would be a determining factor in my build.
Thanks Karl
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Light Bulb Questions
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#2
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Posted 26 October 2007 - 04:13 PM
There are also 575W lamps commonly available, but generally, 400W is good for most builds.
The difference between the 2 LL lamps is hte form factor. The T15 is a single ended lamp which screws into a mogul socket. The double ended lamp sits in FC2 bases. It is somewhat shorter in overall length, making it more convenient for smaller panels.
The T15 lamp is slightly more than 7" from mogul base to the center of the lamp, so it requires that you enclosure either have an extension, or be more than 14" in overall width. Not much of a problem for a 15" or larger panel, since a 15" panel is already more than 12" wide, and a 17" panel is 13.5" wide. But for a 10.6" panel, it seems a waste to have to make the enclosure more than 14" wide.
The double ended lamp, on the other hand can be fit into an enclosure 10" wide, which will fit the lamp and the ends.
Other format lamps are, of course an option, several places do sell other wattage lamps.
Note that many people also use lower wattage lamps, like the 150W ceramic metal halide lamps, which are also popular. These tend to have a smaller arc size, which makes them easier to make more efficient. For smaller panels, these can produce excellent brightness.
The difference between the 2 LL lamps is hte form factor. The T15 is a single ended lamp which screws into a mogul socket. The double ended lamp sits in FC2 bases. It is somewhat shorter in overall length, making it more convenient for smaller panels.
The T15 lamp is slightly more than 7" from mogul base to the center of the lamp, so it requires that you enclosure either have an extension, or be more than 14" in overall width. Not much of a problem for a 15" or larger panel, since a 15" panel is already more than 12" wide, and a 17" panel is 13.5" wide. But for a 10.6" panel, it seems a waste to have to make the enclosure more than 14" wide.
The double ended lamp, on the other hand can be fit into an enclosure 10" wide, which will fit the lamp and the ends.
Other format lamps are, of course an option, several places do sell other wattage lamps.
Note that many people also use lower wattage lamps, like the 150W ceramic metal halide lamps, which are also popular. These tend to have a smaller arc size, which makes them easier to make more efficient. For smaller panels, these can produce excellent brightness.
-- In theory, there's no difference between theory and practice. In practice, there is.
-- There are 2 kinds of people in the world. Those who can extrapolate from incomplete data
My all-pro projector PLOG -- 17" LCD, Pro triplet, LL eBallast, Ushio PS lamp & pro reflector.
My 10.6" PLOG -- 10.6" LCD, standard triplet, LL eBallast, double-ended lamp & pro reflector
Got questions? Please read the FAQ first!
-- There are 2 kinds of people in the world. Those who can extrapolate from incomplete data
My all-pro projector PLOG -- 17" LCD, Pro triplet, LL eBallast, Ushio PS lamp & pro reflector.
My 10.6" PLOG -- 10.6" LCD, standard triplet, LL eBallast, double-ended lamp & pro reflector
Got questions? Please read the FAQ first!
#4
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Posted 27 October 2007 - 09:48 PM
There is the overdriving thread here.
http://www.lumenlab....s...st&p=226246
and there is a lot of people using the 575 HMI lamps which have a 1000 hour life.
A pre condenser helps more than an over drive does so do that first.
I have lots of topic's and testing on quits a few lamps id you want to look them up.
http://www.lumenlab....s...st&p=226246
and there is a lot of people using the 575 HMI lamps which have a 1000 hour life.
A pre condenser helps more than an over drive does so do that first.
I have lots of topic's and testing on quits a few lamps id you want to look them up.
Resident Lumenlegend (and wise-arse).
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