Hi, I recently began, with building my first lcd projector. And I wanted to know, what I could use as a good lightsource. I heard that HQI lamps are the best option. And I have a complete 70w HQI lamp still lying somewhere in my house. So I was wondering if someone may know if 70w are enough for a lcd projector, because it seems like the 70W HQI is much brighter than the 250W Halogen lamp that sits in my overhead projector.
Full Version: Right lightsource?
The HQI lamp I have is a ""VSG70w HQI" from tecnolight. I couldn't find any product description, but I was curious if he can also support bigger lamps than 70w or is it normally designed for only one sort?
Do you have any more information on that lamp? Like Color Temperature or CRI?
Best Bulbs Chart
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Below is a little information that I like to pass along to new members:
The best place to start is The Lumenlab PRO DIY Projector Guide V.3.
Once you have a grasp of the basics, you might want to peruse the pinned topics at the top of the Beginner's Forum. This is also where you should go to create your own threads when you have questions.
Then you can move on to the pinned topics of the DIY Video Projector Design forum and the FAQ section.
When you're ready, you'll need to decide what parts (LCD, Fresnels and triplet) you'll need. To do that, you can use the handy FocalCalc. FocalCalc will help you determine your enclosure measurements and will let you experiment with different parts before buying anything. This will also tell you how far from the screen your projector needs to be (throw distance).
When you start your build, you can create your own PLOG (Projector Log) to chart your progress and to ask questions about your particular build.
I've found that Google Sketchup is handy to use to design and visualize what your projector will look like. And best of all, there's a free version you can use. If you go to the Google 3D Warehouse and do a search for Lumenlab, you'll find that some members have uploaded parts that they have modeled so you can download them and use them in your own model.
A lot of the questions you might have probably have already been asked and answered several times. While most of us do not mind answering some of the same questions repeatedly, you might get more satisfaction in finding the answers yourself. Unfortunately, the built-in Search feature on most of these online forums is quite limited in what it can do. You might find it easier to search using Google using the "site" parameter. Below is an example:
Google search: site:lumenlab.com +"12.1" projector +plans
You can find other parameters by clicking the Google links in my signature.
You might run across a "quirk" when searching using Google, however. If you notice the thread looking "wonky" like this image, simply go up the the top right corner of the thread and click on Options and then Switch to: Standard.
I hope this gets you started on the road to your new obsession and I look forward to seeing your progress.
Best Bulbs Chart
-------------------------------------------
Below is a little information that I like to pass along to new members:
The best place to start is The Lumenlab PRO DIY Projector Guide V.3.
Once you have a grasp of the basics, you might want to peruse the pinned topics at the top of the Beginner's Forum. This is also where you should go to create your own threads when you have questions.
Then you can move on to the pinned topics of the DIY Video Projector Design forum and the FAQ section.
When you're ready, you'll need to decide what parts (LCD, Fresnels and triplet) you'll need. To do that, you can use the handy FocalCalc. FocalCalc will help you determine your enclosure measurements and will let you experiment with different parts before buying anything. This will also tell you how far from the screen your projector needs to be (throw distance).
When you start your build, you can create your own PLOG (Projector Log) to chart your progress and to ask questions about your particular build.
I've found that Google Sketchup is handy to use to design and visualize what your projector will look like. And best of all, there's a free version you can use. If you go to the Google 3D Warehouse and do a search for Lumenlab, you'll find that some members have uploaded parts that they have modeled so you can download them and use them in your own model.
A lot of the questions you might have probably have already been asked and answered several times. While most of us do not mind answering some of the same questions repeatedly, you might get more satisfaction in finding the answers yourself. Unfortunately, the built-in Search feature on most of these online forums is quite limited in what it can do. You might find it easier to search using Google using the "site" parameter. Below is an example:
Google search: site:lumenlab.com +"12.1" projector +plans
You can find other parameters by clicking the Google links in my signature.
You might run across a "quirk" when searching using Google, however. If you notice the thread looking "wonky" like this image, simply go up the the top right corner of the thread and click on Options and then Switch to: Standard.
I hope this gets you started on the road to your new obsession and I look forward to seeing your progress.
Well the color temperature is 4200K of the lamp.
But I already decided to go for a new set, 250W or 400W. I found a shop in my neigborhood, which sells complete sets with ballast, etc. For about 90 euro's (120 dollar).
Only one thing i don't understand, is that i somewhere read on the internet (cant find the article anymore) that a 250w HQI is brighter than a 400W HQI, and the 250W gives a more cleare image. I presume that's wrong isn't it?
But I already decided to go for a new set, 250W or 400W. I found a shop in my neigborhood, which sells complete sets with ballast, etc. For about 90 euro's (120 dollar).
Only one thing i don't understand, is that i somewhere read on the internet (cant find the article anymore) that a 250w HQI is brighter than a 400W HQI, and the 250W gives a more cleare image. I presume that's wrong isn't it?
QUOTE (leendert @ Oct 11 2008, 08:29 AM) 
Only one thing i don't understand, is that i somewhere read on the internet (cant find the article anymore) that a 250w HQI is brighter than a 400W HQI, and the 250W gives a more cleare image. I presume that's wrong isn't it?
Yea that's wrong.
It might have a smaller arc and be easier to use with a precon, but it will most likely still have less lumens than a 400watt.
QUOTE (-sNOOp- @ Oct 11 2008, 09:47 PM)
That is some of the worst vignetting I have seen with a projector recently.
It looks like it was tweaked to get max lumens and not the most even coverage.
Now later in the thread they have some interesting results with a UHP lamp assembly.
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