DIY Video Projector

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#2,361
Re: undream

biteon said:
i was thinking it was when the bulb light it hits 40,000 lms then dorp to 26,000 lums. but yeah thats a dope way to look at what your saying. basicaly one 400 watt bulb last 5.5 years at that usage for our needs.

also i just remembered when i took apart this sh*ty slide projector i got at the good will i saw a whitish frost tinted glass between the light bulb and where the slide picture gose. maybe it kinda like what im doing/ gonna do with glass filters. mixing the light so there isnt that bright spot and reduses the heat.

also the screen door effect. maybe the reason for the grain on the realy projection screens its to make the eye think its a higher res. than what it really it. also when not using digital but film
to make it look sharper to the eye. like figer this: on a smooth screen using a film projector. where the two different colors meet on the smooth screen is probly blurry.but on a grian screen it has a bunch of little square's so where the two different color meet might be in a small square and the eye picks up the majority color in the square.basicaly the eye is kinda fooled to choose a color per square. the squares perimeter is fine and sharp to the eye. there for making the conection of those two color on a fine line.
sharper picture.

im so shock right now cause i only talk like that when im drunk.lol

or maybe a fine screen in front of the lcd. ????

dudes im so close to getting this perfected.
😀 😀 😀 😀
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for really really dark undefined movies, i use a gamma filter (in my computer...) to boost light, however, this creates a hot spot in the middle of the screen, because of my OHP. i use a simple anti-glare filter that i "borrowed" from work. its just something you put in front of a monitor to block glare. it doesnt eliminate the hotspot, but it increases contrast and definition. i will definately incorporate something like that in my final design.
 
#2,362
dude i sujest you guy stop this fight stuff cause sh*T happens and what you guys are fighting about is probly happing all the time. for instance the people reading this tread building there projectors without even leave a single post saying hi etc.
lol funny **** happen when people kick it togetther to long.
lates,talk to ya all later.
😀 😀 😀 😀
 
#2,363
just wanna first start off by saying sorry about the 3 posts in a row. just had a lot to say or comment about...

here is an idea i had. just an idea of course. i think it was undream that was talking about how 400W wasnt enough, and 1000W was overkill, and a middle fo the road would be good. well, what about 2 lower powered bulbs?

I noticed there are some HPS bulbs on bulbs.com, that have a 25K lumen rating at 250W. they are long and slender.

so, my idea is as attached in the pic, take 2 and set them side by side. they are about 9" long and 2.25" wide. (this includes the bulb end). so, effectively, you would have a 8"x5" square of around 51K lumens. and since the bulbs are slender, it would be easy to use a linear fan, or just a couple regular 40mm fans to cool them. and as you can see from the picture, a good 2 inches of the total length is non-light-producing... so, the screen will cover the majority of light area.

here is the link for bulbs.com, $20 each standard 24K hour life... and im not 100% sure, but cant ballasts handle more than 1 bulb? so just 1 ballast for both bulbs.

just an idea.

http://www.bulbs.com/products/product.asp?page=ballasts&class=797
 

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#2,365
HMMMMMMMM

Multiplexor, you might be right, i was kind of acting bad and did not contribute enough to the forum. But i will not apologize to Phazei, because i hate when people call me names behind my back. If he wanted to say something, email me, face to face.
I do not post any certain results because i am working on the cooling even right now, but i did not overcome the problem completely yet. As soon as i do, you guys will be the first ones that i will inform. I do not want to flood the forum, there are already about 15 flooders.
ok, whatever, i hope this settles all the S%$T and the forum can be once again n00b FREE.🙂

aleksey😀
 
#2,367
biteon said:
dude i just pay $155 to find out that the high pressure sodium light bulb sucks, color wise.

another thing the sodium dose less heat than the metall halide, but than again it has more lums per watt
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so, the light color is all wrong? hum, that kinda sucks. and you said it has less heat than MH? or more? becuase if that is the case, there is a way to filter out the color, so we get a white light from it... and that would be a great light source then. a little more $$ than some other setups, but very reliable if done right.
 
#2,369
filter the bad light= less light but good light my guess.

and other than the yellowish tint it projects pretty good in a crappy reflector.
😀 😀 😀 😀

ps. if this color filter dosnt get solve by this weeken im selling my sodium bulb to get a metal halide. i rather find use fans or another crazy idea than investing in to color fiters at this moment.
just cause of a feeling.
 
#2,370
biteon said:
filter the bad light= less light but good light my guess.

and other than the yellowish tint it projects pretty good in a crappy reflector.
😀 😀 😀 😀

ps. if this color filter dosnt get solve by this weeken im selling my sodium bulb to get a metal halide. i rather find use fans or another crazy idea than investing in to color fiters at this moment.
just cause of a feeling.
Click to expand...

i hear ya... its another gamble, going deeper in the hole just to possibly be still in the same hole 🙂

i dunno how much filters cost, but if they are cheap, might be worth a shot. im kinda curious just how warm/hot the MH setup gets... if it doesnt get too hot, i might just go that route. but, if the yellow tint could be filtered, that would be ideal!
 
#2,375
Re: Hope this might help.

MrLoveDIY said:
Micro Lens to capture more light? This might solve lighting issue, lumen, candela this and that.

http://www.canon.com.sg/projectors/multimedia_projector/technology/vizcom_technology.html

===>

A chart on lens, projection area and distance from projector to screen.

Use LED for small area of projection? 4'x4'?


Enzo
Click to expand...

may i please remind ppl to get prices before posting a link??? i mean, canon doesnt make cheap lenses, and this could cost like $500... notice its made for higher end projection systems. It's not gonna cost $100 or less, trust me. So, WHY is it even a consideration for our project?

i would post a DLP unit and be like "hey, check this out, it would be PERFECT!" but could we use it? NO. let's stick to stuff we can USE.
 
#2,377
I know I have learned much about projection in general by observing how the big boys do it. It might not be practical for us to use, but it could get the creative juices flowing. Just a thought. 😎

High pressure sodium bulbs produce the orange-ish/red colored light that is sometimes used in street lamps (my neighborhood has them). This is because they ARE the most efficient light source, even more efficient than metal halide. However, the light is limited to the red part of the spectrum...the rest of the spectrum is barely produced. So filtering the red would leave you with very little usable light.

Metal Halides are nice because they produce FULL-SPECTRUM light. This correlates to the CRI (color rendering index), which is high for MH bulbs. It is rather low for high pressure sodium or mercury vapor bulbs. Once again, MH comes up the winner in this race.

Hey Vince! Good to hear from you again. LED technology is making some real progress, and your original idea of using LEDs will be viable at some point I am sure (hopefully sooner than later!).

Good luck everyone.

-f4
 
#2,380
ive heard of 575 but every one in the public stores thinks im crazy for asking if they have one.

me friend said when i ask to use one of his many hid bulb that he wasnt sure if he had 600watt or 1000 watt or both that i could use but when i went to get the light he hasnt put up yet it was a 400 watt mh fixure and bulb.

im talking like a chick.to many details that dont mean ****.
😀 😀 😀 😀
 
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