I saw a person do a projector with 250 watt halogen floodlight, and it worked fine, even though the picture was a little dark but viewable. Shouldnt then the 1000 watt halogen provide sufficient light with 20000 lumens.I know theres a lot of heat but with a couple of fans and tempered glass theres no reason why it wouldnt work. There is the low colour temperature ( about 3000 k ) but cant you just adjust the monitor settings to balance it out, plus that person wasnt complaining about the colour. Any thoughts ?

is there a reason you don't want to use a 400W MH lamp?

Try it and see if you like it.

But the truth is , it will be dim, yellow , and you won't be able to make it look real good even with monitor adjustments.

Some people don't complain about certain issues because they've never seen what it should look like

I take it you still want to use that long 1000W halogen ? The entire arc of that lamp will never make it through the triplet. Light that does not fit into the triplet will not add anything to brightness. The limit on arc size for a 330/220 fresnel pair and the LL standard triplet is about 40mm, but I would suggest trying to stay around 30mm or shorter for best results. A 150W MH lamp will be brighter than the 1000W halogen you are proposing, and produce nearly 7x less heat. Can you show a link for the 250W halogen floodlight build you are refering to ? Perhaps the use of an integrated reflector made that build ok, like those used in OHP's ?

As I mentioned before, we use the same halogens they use in the movie industry on our machines we build semiconductors with and we use them only for heat!
One of our chambers has 35 1000w halogens in it! from across the room the small window (a 2" round port) shines a bright but very yellow-looking light. (it always reminds me of the color of a yellow flame).
I have access to almost every style halogen made from a 10watt with relector to some 2000w units when I first got into building my own PJ I thought I would have plenty of lamp choices as I can get any of these lamps for free as we replace them on a regular basis when we do the refurbishing and the old lamps are thrown away. With all these free lamps available guess what lamp I use for my projector? Yup, I am using the 400w MH!!!
A lot of people argue that halogens are used in OHP but these are made for printed text and reproduce pictures very poorly.
These guys on here like Jonjandran, Gadget, Supraguy and others talked me out of using these halogens and I am really glad they did!

I've used 2700K bulbs and 3200K bulbs and the main problem is they didn't produce any blue light. What was supposed to be blue in the image was a sort of gray with a little violet in it. It sucked.

There was no way to produce blue if there was none from the bulb.

Tgreenwood