Ace_3000....pictures of Projector?

[part2wanksta]

the reflector. i have a 250w metal halide kit already. actually how much would you sale the lamp set for also

[ace3000_1]

the reflector. i have a 250w metal halide kit already.

Yeah that wont fit either buddy.

actually how much would you sale the lamp set for also

The 175w? not sure probally $40, its brand new so its cheap, its the shipping thats gonna kill.

Trev

[I_eat_flowers]

Originally posted by ace3000_1


And here is that document, (read the fillament part in the chart).

Trev

yeah buddy, that makes it evidently clear to me.
but to reach that aim you have to built in the double sided lamps, haven't you? Coz the -T style or double ended lamps won't be so efficient due to their kind of construction.
I've seen this style on lamps fabricated for medical fiber-optics appz. I think we have to go a way between both styles. that's how you can make it "diy-usable".

I'll keep an eye on this monster -thread. It's always an inspiration. And.....I don't wanna miss the final product.


ief

[ace3000_1]

but to reach that aim you have to built in the double sided lamps, haven't you? Coz the -T style or double ended lamps won't be so efficient due to their kind of construction.

Actually i think its possible to run both in the ellipsidal, there are 2 types you can get.

This is the type i have, (see pic).


I get what your saying though and i agree, but its got alot to do with the power of the frensels too that ive found. Having a frensel with too much power will show the end of the lamp, while having a frensel with less power and you dont see the lamp. I think with using condensers this is realy only good for side mounted bulbs but its doable on both.

Regarding the CDM-T, mines untouched. I just poked it through the hole at the right focal and it works. I think a better bulb would be a CDM-T style with a clear arc tube, we can get these, but hard to find.

Trev

[ace3000_1]

This is the other type of Ellipsidal, though not sure if it would work for what we want. It may work on the double ended variety and infact more then likley the first type would too, providing the focal was long enough. This type would work better with a lamps arc mounted sideways i suspect.

Trev

[18wheeler]

just read some words from this website .

Quote:

The obvious way to increase the optical output of a light source is to employ a bigger lamp. A higher power lamp, however, will not necessarily result in higher optical output from a light source. Since light is emitted by the lamp in all directions, the important thing is not the amount of light emitted, but the amount of light collected.

The *** and the *** have the highest optical power output because they have the highest collection efficiency. They collect and focus emitted light with a single optical element: an ellipsoidal reflector. Because the ellipsoid encloses a large portion of the solid angle about the arc lamp, over 65% of the lamp's emission is collected and focussed at the output.

Compare this to the typical performance of a traditional lamp housing design, such as that used in the **, where roughly 10% of the light is collected. Using identical lamps, the total optical output of the *** is about seven times higher than the **. To get the same optical output as a *** with a 100 watt lamp, a traditional housing would require a 1000 watt lamp!

[ace3000_1]

Heya 18Wheeler, good to see you up here buddy. Thats a great find, its also the exact thing im trying to acheive: Eficentcy.

Ive noticed the arc wonder abit also with my lamp. The bottom of the lamp is more intense then the top. You can see it on a white screen though not overly bad.

Im going to get another one of these reflectors but a smaller one this time with a slightly shorter focal. It should be even brighter still and the image should be more uniform, (though now its near spot on, im just fussy, pluss why not get the thing perfect when you can).

Ill see my contact this week and get a hold of one.

Another thing i did (was last night actually) was use a cold mirror. That makes a bigger difference again, the white is so white yet the black level is so black. Filtering out IR makes the world of diff, the 4200k colour of the lamp must be around 5800k after its been filterd twice. I seriously think the old way absolutly sux compared to this, you just cant beat the colours and the contrast along with the brightness.

I can tell ya now with only the CDM-T and this reflector, its not too far off of being as bright as a crt monitor with the same intensity at 80inches. I had the projector in a test today, and i could still watch it with the sun reflecting off of the window on the screen.

The best thing is 18, is the fact you use CDM-T's, so its a real winner for you.

Trev

EDIT: Just a small note on arc intensity. The smaller the arc is at a certain given wattage, the more intense it becomes.

[18wheeler]

Hi, Ace glad to see your projector has been improving consitantly. Havn't been on the forum for a while until new year. Let me congratulate your marvelous masterpiece!!

for a CDM-T lamp a spherical reflector doesn't work very well. I have to agree with you that ellipsoidal reflectors are more efficient than others. acutually I read in an energy efficient website which states that ellipsoidal reflectors are twice as energy efficient as parabolic reflectors (for recessed fixtures). Only problem for me is that I haven't located a source for the ellipsoidal reflectors so far. But I will keep searching.

Please let us know the improvement with the new reflector!

[ace3000_1]

Thanks for the nice words buddy, though i dont see it as a master peice yet till its done lol.

I got a new optical layout for it in the light engine department which i sorted out today. With abit of luck it should be the smallest footprint using the 7inch . Its probally the most technical aswell, but ill design it in a way so its easier for others to build.

for a CDM-T lamp a spherical reflector doesn't work very well.

I totally agree on that. From past experienes (heh, halogen) the CDM-T should have been brighter then what i was getting in that system. In the end i ended up condensing the arc which makes a massive difference, then i moved onto the ellipsidal. Hands down the ellipsidal wins.

I haven't located a source for the ellipsoidal reflectors so far. But I will keep searching.

Remind me in a couple of days via email, and i may help you

Trev

[I_eat_flowers]

Originally posted by ace3000_1



I get what your saying though and i agree, but its got alot to do with the power of the frensels too that ive found. Having a frensel with too much power will show the end of the lamp, while having a frensel with less power and you dont see the lamp. I think with using condensers this is realy only good for side mounted bulbs but its doable on both.

Regarding the CDM-T, mines untouched. I just poked it through the hole at the right focal and it works. I think a better bulb would be a CDM-T style with a clear arc tube, we can get these, but hard to find.

Trev

Fresnel adjustment is abit tricky. first thing I do is to adjust the light engine and the fresnel abit out of focus, that you don't see the lamps image. Okay, I think that's nothing new for you.

Yeah, I think the CDM-T style is the best, we can get at the moment. We'd made some expieriences with a CDM-SA/T 150 W lamp. The index SA is for short arc. It has a better light output than a common CDM-T. But's hard to find and not cheap. Around 70 Euro.
Here you can find the specs of that lamp. Unfortunately without length of the arc :-(.

Meanwhile I've found a source of an ellipsoidial cold mirror maybe proper for our purposes.