Hi!
I have a bit of a optics problem going on with this thingie of mine so I hope that someone could help me a bit...
I've been retrofitting this projector for few years, and getting better and better results, although not so good that I'd be really happy, I think it should be about as bright as it was with the regular lamp so that I'd be happy.
Ok... so, it's the sony VPL-SC50 which I've been messing with. First with halogens, that was so damn hot that I couldn't actually focus on getting most out of the bulb, I had to focus on how to keep the thing um... not hot (cool would be a wrong word, what ever I did, it was kind of hot :B). Now I have a 150w MH and with this one the heat hasnt been a problem. I already have better results then with the 250w halogen, and the brightness of the original 120w UHP MH isnt far away.
The main difference when comparing this thing to "standard" diy projects here is the really really tiny size of the lcd's. That makes the whole setup work in a bit different way. The problem mainly seems to be that I have been only able to use the light that comes directly from the front of the bulb. Any kind of reflector I've tried on any direction seems to make almost no difference in brightness (I've tried soup ladle and a weird setup with a somewhat parabolic reflector), although the original lamp has a kind of a standard reflector as you can see in the picture I've attached :\
Then a bit about the picture... Here is attached a rough drawing of the optics inside of the Sony VPL-SC50. The yellow dot is the lamp, then there is the fat condeser lens, the purple one is the UV/IR filter, the first gray block is kind of a wavy glass thingie, probably its purpose is to even the light some way (its same kind of thingie the dentists have in the lamps) (the uv/ir has the same kind of waveness), the second gray block is a glass that had some burned (by the halogen) plastic strips on it and the weird structure, and also the metal grill attached to it (the dark thick line there stands for the metal grill), then there's some lense, and the rest is mainly guessing (that's why there is the big question mark) after the first big mirror (the blue lines are mirrors). In the end there are the red, green and blue lcds.
The original is the original setup with the UHP lamp which had nice reflector and so on. V. 0.1 and v.0.2 are with the 150w double ended HID, soup ladle reflector and somewhat fat crappy lense. The v.0.2 gives at least 1/3 brighter image then the v.0.1 (I took out the metal grill and the plastic strip thingie).
Now, as I said, I tried kind of a parabolic beaming thingie and I got reasonable picture with it (something like with v.0.1). It was too big and there was a lot of heat in front of the lamp so I dumped it. The v. 0.3 is the setup that is now in the system, and it's definetly best so far (it was first with a soup ladle but I took it away as it did nothing that I could see resulting more brightness on the wall, no matter what angle and distance to the bulb it was).
The "problem" or more of a invitation to a brainstorming is the v.0.4 that I am thinking. The idea would be simply use two mirrors to reflect the backside of the lamp so that it appears to be on top of the actual lamp if looked from the direction of the projector. I think that then the extra light would end up to the tiny lcds? I probably am going to try this even if no one answers this mail, but do you think that this is a good idea? Any other ideas about how to make this thing work better would be appreciated too...
Regards
HB
I have a bit of a optics problem going on with this thingie of mine so I hope that someone could help me a bit...
I've been retrofitting this projector for few years, and getting better and better results, although not so good that I'd be really happy, I think it should be about as bright as it was with the regular lamp so that I'd be happy.
Ok... so, it's the sony VPL-SC50 which I've been messing with. First with halogens, that was so damn hot that I couldn't actually focus on getting most out of the bulb, I had to focus on how to keep the thing um... not hot (cool would be a wrong word, what ever I did, it was kind of hot :B). Now I have a 150w MH and with this one the heat hasnt been a problem. I already have better results then with the 250w halogen, and the brightness of the original 120w UHP MH isnt far away.
The main difference when comparing this thing to "standard" diy projects here is the really really tiny size of the lcd's. That makes the whole setup work in a bit different way. The problem mainly seems to be that I have been only able to use the light that comes directly from the front of the bulb. Any kind of reflector I've tried on any direction seems to make almost no difference in brightness (I've tried soup ladle and a weird setup with a somewhat parabolic reflector), although the original lamp has a kind of a standard reflector as you can see in the picture I've attached :\
Then a bit about the picture... Here is attached a rough drawing of the optics inside of the Sony VPL-SC50. The yellow dot is the lamp, then there is the fat condeser lens, the purple one is the UV/IR filter, the first gray block is kind of a wavy glass thingie, probably its purpose is to even the light some way (its same kind of thingie the dentists have in the lamps) (the uv/ir has the same kind of waveness), the second gray block is a glass that had some burned (by the halogen) plastic strips on it and the weird structure, and also the metal grill attached to it (the dark thick line there stands for the metal grill), then there's some lense, and the rest is mainly guessing (that's why there is the big question mark) after the first big mirror (the blue lines are mirrors). In the end there are the red, green and blue lcds.
The original is the original setup with the UHP lamp which had nice reflector and so on. V. 0.1 and v.0.2 are with the 150w double ended HID, soup ladle reflector and somewhat fat crappy lense. The v.0.2 gives at least 1/3 brighter image then the v.0.1 (I took out the metal grill and the plastic strip thingie).
Now, as I said, I tried kind of a parabolic beaming thingie and I got reasonable picture with it (something like with v.0.1). It was too big and there was a lot of heat in front of the lamp so I dumped it. The v. 0.3 is the setup that is now in the system, and it's definetly best so far (it was first with a soup ladle but I took it away as it did nothing that I could see resulting more brightness on the wall, no matter what angle and distance to the bulb it was).
The "problem" or more of a invitation to a brainstorming is the v.0.4 that I am thinking. The idea would be simply use two mirrors to reflect the backside of the lamp so that it appears to be on top of the actual lamp if looked from the direction of the projector. I think that then the extra light would end up to the tiny lcds? I probably am going to try this even if no one answers this mail, but do you think that this is a good idea? Any other ideas about how to make this thing work better would be appreciated too...
Regards
HB
Attachments
Ok... I just tried a mirror as a reflector and didnt see any difference in brightness :B
Well... I'm really running out of ideas, I am quite confused about the fact that the original setup was with a reflector and no condenser lens, and only setup I seem to get work well is a setup with no reflector and just a condenser lens :\
Any ideas? Anyone?
HB
Well... I'm really running out of ideas, I am quite confused about the fact that the original setup was with a reflector and no condenser lens, and only setup I seem to get work well is a setup with no reflector and just a condenser lens :\
Any ideas? Anyone?
HB
Forget the whole thing / unohda koko juttu. UHP bulps are special not only because they are smaller but also their color and efficiency will not degrade in use as will happen with MH and halogens. Rather look for the cheapest UHP bulp (PJ-TX10 bulp is quite cheap) and retrofit your pj with it.
Btw. The light intensity of an 100W UHP bulp corresponds to 250W metal halide bulp (and maybe about 500-750W halogen).
Um... no I wont forget about it/enpähä unoha, the 150w MH seems to work pretty nicely, I've definetly have about 60-70% of the original brightness of the projector with current setup (no reflector, so something like 70% of all the light the lamp generates is definetly lost), and the bulb costs about 30e each and has about 6000-9000h life... and also, I do not have power supply for a UHP lamp as those tend to be DC powered thingies, and cost about at least 5-10x compared to these standard MH bulbs...
I am just trying to figure out ways to harvest a bit more light from the lamp :\
Regards
HB
I am just trying to figure out ways to harvest a bit more light from the lamp :\
Regards
HB
I've used single MH bulp for an year now and after about 500 hours (~10 hours / week) of use it's visible degraded. It's time to get a new one. Where did you find a one for a €30 piece?
Well, at http://www.finnparttia.fi they sell 150w WDL MHs at 27e and the NDLs are 39e, although I think that's a bit expesive place, probably about any place selling electrical supplies will sell them cheaper, I dunno :\
HB
HB
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