Let's forget about the heat factor.
Let's say we take a 1500w halide and put it there. 135,000 mean lumens. 500-1000 lumen output possibly?
Let's say we take a 1500w halide and put it there. 135,000 mean lumens. 500-1000 lumen output possibly?
better to work on the reflector (parabolic and bigger than the screen) than to increase the bulb wattage
You are perfectly right. I proceeded accordingly, made a reflector and got excellent results. The details of the design, screen shots and mathematical aspects may be seen from my web page http://www.drtsolutions.com/Projector.htm The results are excellent even at the default level of brightness of 50% of LCD and have been even apreciated by the experts.renan said:
nice work ramkisham, have you though about a luxmeter test to meassure the lumens there on your projector?
Also, could you tell us the exact 13.3" TFT model you used? Any FFC cable issues? see you
Also, could you tell us the exact 13.3" TFT model you used? Any FFC cable issues? see you
Nice work (and clever advertising of a law firm), but how to manage the problem, that there would be rays going parallel from this big mirror, and those omnidirectional rays from the point of lamp arc? Can't see how it would work well, in my opinion it would increase total light output, but degrade image quality, contrast and sharpness.
Here is my latest "achievement": I wired a second 150W ballast parallel to previously existing 400W ballast, thus raising the lamp power to about 550W. I measured increase of light output at about 64% (using "photographic method"), and LCD temperature increased from 29C to about 33C after 2 hours of operating. This is best improvement so far, but I currently use an old 575W projector bulb, so I can't recommend overpowering a standard 400W bulb (which I will try anyway, when this 575W bulb burns out, it's rated life is 750h, so it might be soon).
Regards
Here is my latest "achievement": I wired a second 150W ballast parallel to previously existing 400W ballast, thus raising the lamp power to about 550W. I measured increase of light output at about 64% (using "photographic method"), and LCD temperature increased from 29C to about 33C after 2 hours of operating. This is best improvement so far, but I currently use an old 575W projector bulb, so I can't recommend overpowering a standard 400W bulb (which I will try anyway, when this 575W bulb burns out, it's rated life is 750h, so it might be soon).
Regards
Thanks a lot for your comments. I never felt need of luxmeter as brightness is quite high. The 13.3" TFT XGA Monitor brand is 'Super' Type SP-13A imported through e-bay. FFC Extension ribbon cable imported from lumenlab. Details of problems faced and solutions found described in my web pageRox said:
sorry the coment but i found your webspace too messy (hard to find expecific information...)
mmm, ribbon... thanks for the input.
about the true native resolution... are you sure it is XGA (1024*768)? sometimes the sellers do cheat the true resolution with the max suported input resolution... (interpoled...) I had suprises checking the pixel dot size and the displayed image size specs... very interesting numbers there 😀 (you can work out the number of pixels with these info).
see yo
mmm, ribbon... thanks for the input.
about the true native resolution... are you sure it is XGA (1024*768)? sometimes the sellers do cheat the true resolution with the max suported input resolution... (interpoled...) I had suprises checking the pixel dot size and the displayed image size specs... very interesting numbers there 😀 (you can work out the number of pixels with these info).
see yo
Thank you very much for your nice comments.pepe303 said:
Our core business activity is highly specialized legal work. There is no intention of advertising as none of the DIY entrepreneurs would be my clients. Further my clients are rich industrialists who will never be interested in DIY Projector.
The reason for using space of our own web site is convenience of instant uploading without any restrictions of time and space on 24X7 basis from my desknote computer even using my mobile.
I find that 400W metal halide with reflector is more than sufficient for dark viewing of movies. As we operate on 50% default setting of brightness level of LCD. Sometimes we have to reduce the brightness to 20% alongwith contrast and RGB levels. The image quality is excellent and I intend to improve further by various means described in my web page.
It is very difficult to reply individual queries. I go on updating so that visitors particularly newbies may find useful information at one place with theory and application. Hence it is becoming exhaustive or your are right "messy" to that extent.Rox said:
The LCD panel is manufactured by Sharp it supports "PC, VGA many kinds of display models such SVGA, XGA etc' During settings it shows resolution 1074*768 pixels. I got the specification confirmed and checked the manual before placement of order. In fact I purchased this monitor exclusively on consideration of XGA resolution.
Pepe, gotta say, that was a good idea, although kinda surprised that you even mess with it, since from all my reading here, you acted like diy is useless. Keep us informed on your lighting situations. Not bagging on you or anything, just thought you gave up on it. 🙂 Must be in your blood, can't give it up until you have the best. 😉 Same with me, I have tried a 750w reflector light, I have the Ushio inside now, and have a 1500w that I am gonna try next. So, some day 😱
Ramkishan: Do you believe that you have the best projector there is? I have seen you post several times the same over red, over blue images. I tried being nice, but you seem to go everywhere to just show off your projector, which isn't anything that someone hasn't done. You put your wife in them all, which I'm not sure why. And using a 400w light means you have nothing better than anyone else. I have one that is built with a full stereo speaker system in the bottom along with a 12 sub, and a built from scratch triplet, that works exceptionally well. But I have only posted it where I go, and that I contribute to that forum regularly. I may post it here after I get the 1500w light in, and do a lux reading. I don't post here with photos, until I have the best, because these guys are beyond your projector. But to go and just keep showing mine off, when it isn't anything special, is just rude. We have all seen your stuff, so no need to keep posting it anywhere else. OK.
Ok
Flame away. I just had to get it off my chest. 
Ramkishan: Do you believe that you have the best projector there is? I have seen you post several times the same over red, over blue images. I tried being nice, but you seem to go everywhere to just show off your projector, which isn't anything that someone hasn't done. You put your wife in them all, which I'm not sure why. And using a 400w light means you have nothing better than anyone else. I have one that is built with a full stereo speaker system in the bottom along with a 12 sub, and a built from scratch triplet, that works exceptionally well. But I have only posted it where I go, and that I contribute to that forum regularly. I may post it here after I get the 1500w light in, and do a lux reading. I don't post here with photos, until I have the best, because these guys are beyond your projector. But to go and just keep showing mine off, when it isn't anything special, is just rude. We have all seen your stuff, so no need to keep posting it anywhere else. OK.
Ok
Flame away. I just had to get it off my chest. The details of the lighting are given in the web page itself. Since the brilliance is more than enough even at 50% default setting of brightness of the LCD obviously means more efficient utilization of electrical energy of 400 W metal halide bulb for 120" wide image at a distance of 22 feet. It may not be special for you but just for your information several experts have appreciated it. They are putting links on their web site to our web page.Miedosoracing said:
The colours are true colours of the movies. How can you say over without comparing with the originals, it is not understood.
Presence of some one on the screen (wife as we are only two and all my three children and grand children live in their own homes) gives better assessment of size of the projector screen
My posts are liked by several persons as on average there are more than 2000 hits per day. Majority appreciate but few may not like it. It is reiterated that special thing is easy adjustments from the front during running condition for most optimum image as well as maintenance. My posts are few and brief. As soon as my optimisation is complete, I myself will stop posting as my web page will be quite enriched and the needs of the visitors particularly newbies will be fulfilled in respect of nearly complete information at one place. Till such time, you are welcome to skip.
Miedosoracing said:
Well, I'm trying to get something useful out of this big box of expensive crap. So I got this extra ballast, it was pretty cheap, about 15$, and it made a noticeable improvement, and chances are, that it will soon kill both the bulbs I have, and my wife will not object of buying a real projector 🙂
I really hate wasting things and work, I could go and buy a decent projector, as they are pretty cheap nowadays, but I would regret the time and effort I spent building this monstrous piece of "furniture". And I have to say, that with this extra power it is pretty useable. It's not way brighter, as our eyes easily adapt to a wide range of brightness (that's why some dummies claim they get "1000lm" out of their DIY projectors), but the picture is more colorful and saturated, more pleasant to watch. And it's definitely best of all tweakings I've done so far, including famous antiglare removal.
Regards
Well, I thought since you were only running a 400w and a 150w,. it would be better on the 575w bulb, and make it last longer. I know Dallas uses 400w bulbs in their 250w ballast street lights. I know that as for I did a little snagging when one got knocked over. I was quite surprised to find that.
ramkishan, do you have a link where I can find the Sharp 'Super' Type SP-13A LCD? I am interested in this.
The bulb assemblies of commercial projector costs nearly $300 dollars or more and life is hardly 2000 hours as against $15 and 10,000 hours. The LCD life is also much more in DIY as in commercial projectors the temperature is considerably high.pepe303 said:
Size of my projector is comparatively small due to smaller LCD of 13.3" and folded design. Since it is placed on top of an almirah at corner of the room at a distance of 22 feet from the opposite wall (I have given the pictures of the room and placement of the projector), it does not disturb the space of the room at all.
I did not go for antiglare removal as already the brightness is quite high and such removal is risky.
We love our projector though it has cost nearly $300 but then I coached my grand children as how to create and enjoy it.
Mikey p said:
The details of my purchase of May '05 are as under. You may contact the seller at his e-mail id monkey32021@hotmail.com
5770045593 13.3'' TFT XGA LCD FLAT PANEL PC TV MONITOR W/SPEAKER 1 US $228.00
Subtotal: US $228.00
Postage and handling via Standard Int'l Flat Rate Shipping:
US $61.00
Shipping insurance (Optional US $5.00): --
Total: US $289.00
Hey pepe, did you wire it like you would a car speaker. Meaning white to black, and white to black opposites to the light? I thought about it as well, but just was worried about blowing something up or myself😉
Also, are there any 575w bulbs that have good color around 5200k that can last a long time? That sounds like it is a good improvement. Then with the lumen lab reflector maybe, that would put you over the 500 lumen mark maybe.
I just checked up e-bay, 12.1" LCD XGA Monitor/TV with TV Tuner is available at approximately $110, the link is - http://cgi.ebay.com/12-1-LCD-XGA-Mo...871959550QQcategoryZ61398QQrdZ1QQcmdZViewItemMikey p said:
You may check up in this category, there may me more such monitors and even smaller and cheaper also with XGA Resolution.
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