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Old 12th January 2004, 08:10 PM   #1
mathias is offline mathias  Sweden
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Question Put a HQI-bulb in a commercialprojector

I have now finished my diy-projector, consisting of a 15" TFT and a 150W cdm-t bulb, and a new light engine that use most of the lumens the bulb produce (more info about how the lightengine works you can find in the thread "videoprojector part II" page 116), Iīm satisfied with the picture quality and the brightness. But the diy projector is too big and beautiful isnīt it. It looks like a nuclear-missile, And if I mount it in the roof I will get pretty flat if it falls down

So I have thought of an other idea: Buy a cheap commercialprojector, people are selling them cheap sometimes because they canīt afford to buy a new bulb. Replace the expensive UHP-bulb (Ulta High Preformance) with a cheaper HQI-T 150W bulb, of course I have to use an external ballast. My question is what ANSI-lumen can I expect if I do that ?
Let say the commercialprojector use a 150W UHP-bulb and give 1000 ANSI-lumen with that.
Is the UHP-bulb so much more effective than a HQI-bulb ?
Will it be brighter than my diy-projector ?
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Old 12th January 2004, 08:26 PM   #2
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I think the trick will be to
1.trick the projector into thinking the bulb is fine
2.Focusing the parabolic reflector from the old bulb with you new, cheaper replacment. Kinda like your picture. this would give you about the same ansi lumens (assuming the bulb your using has the same lumen output as what its replacing)
3.Fit you cheaper and probally larger bulb into the space intended for that tiny blub.
If you could overcome these problems this would be a very cost-effictive way to go with a DIY projector, and alot nicer too. Plus the pj would be BEHIND the seating area.

Let me know if you try this, i'd be very interested in the results!
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Old 12th January 2004, 09:59 PM   #3
msx-2 is offline msx-2  Netherlands
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i tried to do this with my proxima dp2800. However space is very limited and the light path is far from perfect(dp2800 uses about 4 first surface mirrors ,and the beast is a hell of a difficult machine to get apart (never seen a electronic device so difficult to dissasemble). Maybe in the future i take the thing apart and put it into a new housing. However, i think my lcd-controller is a little screwed up . There is some kind of raster over the projected image (its not the fresnell) .It's very strange and i don't know what it is.
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Old 13th January 2004, 01:36 AM   #4
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I wouldn't be surprised if some of that OEM bulbs specialness is marketing hype. The only issues I can see that you need to deal with are element alignment and UV and IR issues. For instance the OEM bulb may have IR glass around it to reduce the heat output.

Hezz
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Old 14th January 2004, 08:49 PM   #5
mathias is offline mathias  Sweden
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If I can in some how put the HQI-bulb in right place and focus it, and I mayby need to put the bulb a little outside the commercialcase in a extra box, but does anyone know if I can turn of the message "Please change the bulb" that I have seen in some shop ?

Which projector will be brightest and the best choich ?

1. Diy 7" TFT lilliput, with a 150W HQI, 200:1 contrast, 800*480 res.

2. Cheap commercialprojector 3 panels TFT 400:1 contrast, 800*600 res, change bulb to a 150W HQI.

I have seen some old projectors on the market that use one 6" TFT panel and a 250W HID, and this this thing only put out 250 ANSI lumens, wouldnīt the 7" TFT lilliput thing get less bright ?
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Old 28th January 2004, 09:21 PM   #6
mathias is offline mathias  Sweden
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Default Yes I think we can do it.

I finally bought a cheap commercialprojector, I couldnīt resist, the price was only what you pay for two 15" tft monitors. Well the UHP-lamp will last in 1500h and a the price for a new one is the same as for a new 15" tft. So of course I will not buy a new lamp-unit.
I found out that a UHP-bulb is actully the same as a HID short arc lamp, so the only diffrents between a HQI and a UHP is that the arc is smaller in the UHP, the light output is the same.

The UHP-lamp unit puts out a parallel beam that is 50mm wide. I think itīs not so difficult to build a HQI-light unit that puts out a parallel beam of that size. And because the light is parallel we can use a mirror so we can place the light-unit outside the pj-case.
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Old 28th January 2004, 09:34 PM   #7
mathias is offline mathias  Sweden
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UHP-unit front picture.
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Old 31st January 2004, 12:51 PM   #8
mathias is offline mathias  Sweden
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Default Which projector will be brightest and the best choich ?

I asked before which of the two choiches below that are the most worth to buy.

1. Diy 7" TFT lilliput, with a 150W-250W HQI, 200:1 contrast, 800*480 res.

2. Cheap used commercialprojector 3 panels TFT 400:1 contrast, 800*600 res, change bulb to a 150W HQI.

I did a very intressting comparision between the two choiches.

The pictures to the right are the diy-projector and to the left the commercialprojector. The pictures up is with the lights on, and down itīs off. The diy-projector, consisting of a 15" TFT and a 150W cdm-t bulb, and the new light engine with a PAR30-reflector. Because I use the PAR30 reflector it will be equal to a 7" -design.

The pictures are taken with the same camra, same dvd-player, same surrounding light and same screen-size 100". My camra donīt like dark pictures, so what seems dark is not so dark. Which would you choose ?
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Old 31st January 2004, 01:04 PM   #9
mathias is offline mathias  Sweden
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This is a another screenshot of the diy-projector, bright isn,īt it ?

Well, now the screen size is only 60", so itīs very easy to get foold.
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Old 31st January 2004, 01:16 PM   #10
mathias is offline mathias  Sweden
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IīM SORRY I WROTE WRONG !
THE DIY-PROJECTOR IS TO THE LEFT AND THE COMMERCIAL TO THE RIGHT !
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