Hi guys,

I'm building my first pj and it's half finish and need some direction from the experts here.

Here are what i'm using:
- Super PD8419 LCD
- Phillips HPI-T Plus 250 watts + Ballast
- Standard lenses kit from LL
- Tempered glass
- 120 mm AC Fan
I'm not using pre-condenser lens and reflector.

The LCD specs are:
- 800x600 native res
- 8.4" 4:3
- 250:1 contrast
- 0.21 mm pitch
- 22 ms response time

The lcd strips very easy, The enclosure using MDF 9mm thick. Projected to wall.

The result so far is good but not very impressive compared to commercial pj (there's no WOW! factor). I think the colors are not bright.
I have several questions to experts here:
1. How do I know there is AG in my lcd. Should I remove it? is it a must to gain color brightness? or is it because the 250:1 ratio that makes the colors not bright?
2. I try a plain aluminium plate for reflector but do not see any improvement.
3. Do I have to paint the inside with black?
4. I have BO cloth from LL but it wrinkled, can I ironing it?

Thank you. I will post some pics after I finish assemble BO cloth screen.
Sorry for my english because it is not the first language.

Regards,
Lewi

well, just adding a really good reflector(like the pro reflector in the LL store) can increase your brightness by 50%.... and for an 8.4" lcd a precondenser would increase that by more, how much I don't know, but I would guess that adding a good reflector and preconenser could easily double your brightness....
painting the inside of the pj will help, especially with a low contrast monitor..... as for the anti-glare, I'd first add the reflector and precondenser, ag stripping is very helpful but can be a challenge sometimes so go for the things you can fix fairly easily then worry about the ag stripping after that.... no idea about ironing the BOI cloth, I think steaming is better but...

Thanks mikyd, Is that true I can increase brightness by 50%, I will try to find a good reflector from local sources.

yes, using the pro reflector from LL light increase has been measured at 50%, generally stainless steel reflectors(bowls etc) will boost light about 25%, a good spherical aluminum reflector will be about the same as the pro reflector, what type of bulb is that? do you have a link? the shape will make a difference to what kind of reflector you can use, I'm guessing you are not in the us?

You're right, I'm from Indonesia.
The bulb is Metal Halide HPI-T Plus. The shape and dimension is pretty much the same as LL T15 lamp but I do not know the color temp number.

PJ Sketch
Click to view attachment

could just be me, but i think you'd be better off if you put your fan on the bottom and left an exhaust hole on top. That way the cold air is being aggressively pushed in and out, rather than simply drawn out. besides pc fans dont draw air that well, they do better pushing.

never mind, didnt realize it was top view.

I never tought that, it makes me think twice about the design. It is my biggest concern about how to remove the hot air from the box. After several minutes testing the MDF board at the back of lamp get little burnt , I should check the temperature in there .
The fan is not a pc fan i think.

Sounds cool, nevermind the screen for now; let's just have some pics already! MUST SEE. Post a lot.