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Old 1st December 2011, 08:20 PM   #1
DonoMan is offline DonoMan  United States
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Default Will this lamp work in my projector?

I have a Marantz VP-12S4 720P projector. While I would like to upgrade to a 1080p projector, I don't see any that I like at a price that I can afford. I tried the Chinese bulb route from this site a while back but I was unable to do a clean job of installing it into the reflector. I tried relampit.com and they just gave me a refund after three lamps that they sent (the second two being warranty replacements) failed very quickly and stopped even listing Marantz on their site. The setup worked perfectly with the stock lamp so I am confident that they were failing because the parts were either low quality or not the right part (AC lamps perhaps?). I wanted to put in a metal halide at one point but I was talked out of it and now understand why that wouldn't work out well (and why MH isn't as good).

Okay, so Projector Central says I have a 200w DC mercury vapor lamp: Marantz Projectors: Marantz VP-12S4 DLP projector

I am aware of the difference between AC and DC in these lamps, and I know that most of them are AC, which won't work with my ballast.

I measured the reflector to be 65x70mm. It's a P22 reflector. I couldn't measure the depth because the lamp itself is not in the reflector.

So the only lamp that I have found that looks potentially right to me - the right wattage, the right reflector (I think), and DC, is this: https://www.interlight.biz/light-bulb/UHP-DC-200W-P22A

Do you guys think it will work? Also, is that a reliable site? Or do you know any others that are better?


Thanks,

Dan
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Old 3rd December 2011, 03:55 PM   #2
Bohanna is offline Bohanna  United States
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I believe that this is a UHP lamp that vents at or through the rear. This may be why you have had problems with failing lamps. My guess is they worked great for the first 10 or so minutes and then they Popped! I am also guessing that the replacement lamps DIDN'T have the little vent slotted piece that is glued to the front of the reflector.. If this is the case It looks like this lamp might work for you but ONLY If your lamp looks like this one pictured with the off yellow reflector and it vents at the rear. This was a great way to concentrate the air flow onto cooling the lamp but the lamp reflectors were so much more expensive than the sealed UHP lamps that it was cost prohibitive. I would call the company and MAKE sure the lamp you are buying looks Like this and is not a sealed non rear vented lamp. Bottom line is if your original lamp had this kind of rear piece you need to replace it with one that is similar.
Hope this helps

Bohanna
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Old 3rd December 2011, 07:29 PM   #3
DonoMan is offline DonoMan  United States
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Hmm, is that supposed to be off yellow? Mine isn't. I didn't realize that some lamps were; I figured it was just the picture. And mine has two notches at the front by the glass to vent, so I think it's different than the one that I linked. Also, the glass piece has some sort of metal thingie clipped onto one side. Not very big.

This is the only 200W DC P22 lamp I have found online. There are plenty on that site that don't say DC but I assume those won't work.

Last edited by DonoMan; 3rd December 2011 at 07:44 PM.
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Old 3rd December 2011, 07:44 PM   #4
Bohanna is offline Bohanna  United States
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Does your lamp vent out of the rear or is it a solid cemented piece at the stem?
What does your lamp have for numbers on it??
Can you post a picture of the lamp? I believe that UHP lamps are AC. They replaced the older Metal halide DC lamps that were DC but I am not 100% sure of this
Was I correct about the replacement lamps you tried Popping?

Bohanna
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Old 3rd December 2011, 08:22 PM   #5
DonoMan is offline DonoMan  United States
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http://www.sosdan.com/marantzlamp1.jpg
http://www.sosdan.com/marantzlamp2.jpg

There is absolutely no text anywhere on the reflector. I know some do, but not this one. I do not have the capsule that was in there before, so I can't tell about that.

One replacement lamp worked but had TONS of flicker. One was DOA. One blew after a month or two.

Could ProjectorCentral just be wrong about it being DC? The guy who was selling the "BSM" Chinese lamps did have "BSM-DC" lamps.
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Old 3rd December 2011, 10:15 PM   #6
Bohanna is offline Bohanna  United States
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My guess is the one that you listed would work since it DOES vent through the rear but the little metal tab attached to the front of your original indicates that this MAY be the way air gets funneled into the lamp so as Long as the intake vent on the replacement lamp lines up with the projectors air path you are good to go. Either way you really have an odd duck lamp. I HAVE never seen anything quite like it. The lamp may be a UHP but the reflector is a bit weird (to say the least). The flicker could be from a knock off lamp or you got a lamp with an older metal halide element. I have seen them flicker and fail before as they are put in a place where there is a UHP Ballast. Look at the light chamber is see if you can see how the air gets INTO the lamp and if it will line up with the new Lamp.

Bohanna
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Old 5th December 2011, 03:18 PM   #7
DonoMan is offline DonoMan  United States
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I got an email from Aaron @ Interlight that basically says he can't make a recommendation because there is no useful identification on my current reflector. I am still not sure if I want to spend the money to try this out. I would like to get this projector working for (significantly) less than $700, but I am a bit worried that I might be wasting the money if this doesn't work out.

Any second opinions?


Thanks
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Old 5th December 2011, 03:37 PM   #8
Bohanna is offline Bohanna  United States
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dude I think your are screwed. I think that the lamp you referenced in your first post was a UHP which I beleive is AC and the animal you are looking for is an SHP which is DC. It looks like they BOTH vent through the rear but I don't think that a UHP will work for you . I also read some where that the projector uses the ONLY DC lamp in the industry. Sorry to be the bearer of Bad news

Bohanna
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Old 5th December 2011, 03:40 PM   #9
Bohanna is offline Bohanna  United States
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A little more info about the lamp,, sorry dude

hxxp://www.aboutprojectors.com/Marantz-VP-11S1BL-projector.html
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Old 6th December 2011, 12:49 PM   #10
DonoMan is offline DonoMan  United States
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What does it matter if a lamp says UHP or SHP, as long as it is DC? I'm sure the colors won't be the exact same between manufacturers, but can they really be THAT different?
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