Well, this is my last adquisition, this is an eliptical reflector, I belive the lumens efficiency to be as good as a 400W lamp (or better but I have a 150W one).







promising...

What manufacturer and model?
Price?

What lamp is that? (looks like a CDM-T, short arc version?)

the lamp is 150W mastercolor CDM-T (G12 socket) by philps 4200K, 13000 lumens, 9mm arc and 6000 hours (somewhere 50€ here in my city).

The reflector is from china suplier, the problem with those is always the same; the minimun quantity, shipping... I had to buy 10 of them. I believe it to be the same as the one available in edmund here

the final price for me was like 40$ each.

Nice find but can someone please explain to me what good a parabolic reflector would do? Heres some images as to the way I see it...

top left image would be the correct setup for the eliptical reflector. The parabolic one should have parallel output so none of your images is actually a parabolic setup, the right down is the closest thought.

Gotcha, thanks for clarifying

does it need a ballast? 110v or 220v?

the lamp is a MH 150W lamp, you need a ballast as any other MH lamp.

either a e-ballast of 150W or a magnetic ballast of 150W (M102 ansi rated ballast, either 50/60Hz or 120V/220V)

Elliptical

What material is that made out of Rox?

it is some kind of glass and there is a dicroich layer on the reflective coating. This means the light is reflected but the IR (heat) is passing trhow the elptical refelctor. This is very good for a better cooling system. In fact i belive just 1 80mm fan would be enough to cool the lcd (remenber i only plan on 150W) but do not think i won´t achieve ll's brightness (still on beta fase ).

Well, maybe if stripping the antiglare off the front of the monitor and replacing the polarizer works all you might need is that 150W. I think that reflector is too small for me, but I am curious to know its size.

A cold reflector, that SMART.

P.S. Why don't you post an image of it in the reflectors thread?

eliptical reflectors have been discussed there more than once.

one of the interestingpoints on the reflector is that you can place a lens in the second focal point to adjust the light cone to the desired one. I don´t plan on it because i am going for 8" hami lcd. It should work nice without any condensor lens.

sorry for updates, but i go in slow steps. keep an eye here.

I'll be watching anxiously. I'm building an 8" hami right now, but using 400w ushio. I'd love to be able to use a small bulb like that.

tiny incandescent light. It does not blind you like the MH lamps


2 watt, enough for the eliptical Focal test.


inside


the light circle on the desk is dependent of two things; distance from the eliptical reflector to the desk and deph of the lamp inside the reflector.


smallest circle on the desk i could achieve was 1cm diameter. But it will certainly get bigger because the burning arc on the MH will be larger than my microlamp.

interesting...

Any updates on this reflector/bulb combo? I'd love to put one in my hami build...

Rox,

I'm thinking about going with a 150W small arc lamp. Could you tell me your experiences. Is it too bright or too dom, etc.

Rox's hands.... scary. He does exist.

Come on rox, updates

mmmmmmmmm

pushy pushy

I have figured it out,,,,

now for my experiments

The hand and what's with that finger nail thing?

The smooth pure elliptical reflectors have no ability to overlap the arc image to wash out the steel rod that the single ended lamps must have to provide power to the other end of the lamp. Most of the pure elliptical reflectors like in a movie theater and many PJ , the lamp and use a double ended lamp, this puts the other end away from the focal point of the fresnel and the over lap of the reflector fills in the hole.

A HMI 575 lamp would be good for that reflector. Or any double ended lamp with small ends.

Do you see the lamp rod n the final image?

whats wrong with those finger nails?

Click to view attachment

yea, I learned to use the left hand when "evacuating" the elements from my nose with the finger... It hurt the first time I forgot I play the guitar with the right.

Ok it will be a pic at each post so take it easy...

Click to view attachment

the native lamp. 150W CDM philips G12 single ended lamp. 4200K (942)

Click to view attachment

and this is the source of the only issue with the lamp, the fking wire shadow effect source
this wire is being focused with the eliptical reflector and the light on lcd plane (fresnell surface) shows a clear artifact where the wire is located... rotating the lamp does rotate the shadow too. I did several tries solving that issue... grasping the outer glas with a "stone" triyng to make it difussive so no longer the wire is seen trhow the glass... it helped a lot but was not enough... then tried more difussive layers out after the eliptical f2 point... it was too difussive that the light was not controlable...

finally decided to go for the lamp strip.

Click to view attachment

well, some steps back; this was the first attemp. The CDM was at my possesion but the price was that high comparing to the HQI that I was scared to broke the outer glass on the CDM... I tried with the HQI first.

then I found issue number 2;

the small drop on the burning capsule (located at left on the photo) was doing similar artifacts as the wire on the philips. The lamp is focused with the eliptical reflector and that small drop couses light uneveness problems too.

Click to view attachment

the attatchement was done with "patex". This is two component "glue" that after a complete mix is very strong and can work at high temperatures.

Click to view attachment

well, finally the last version (actual)

the burneing capsule is simetrical in the 360 degrees, no any imperfection. The light distribution is just perfectly even (in 360 patern, axial is another thing, it depends on how deph the lamp is on the eliptical.

(I have to do a pause here, have to go now but will be back like in an hour, will post few more photos).

Click to view attachment

the reflector is inside a tube with the fan in the bottom.

the next 3 photos are triyng to show how the arc is seen trhow the focal point F2. the 3 photos are with small angle steps (the arc is mirrored from corner until center where the perfect focus is shown).
Click to view attachment

Click to view attachment

Click to view attachment

here you can see that all 360degs on the arc is seen from the F2 point.

those are the photos by now. I will assemble the projector again and take more photos. the weekend will be bussy for me so do not expect news in a while.

What's taking so long to get that projector together?

DJ

What are the f1, f2, and diameter of that reflector?
I presume that HQI was the 150W version.

DJ

Is it done?

Rox,

You're spending far too much time plucking around with your guitar. PJs are supposed to be a priority!

would the double ended version of the cdm-t work roughly the same?

It’s been 7 days since rox has been on, what’s going on here rox?
All right I’m gonna risk this and say your not really using a 150w lamp and an elliptical at all. It’s just a plastic torch reflector and a small candle.
The balls in your court now, waiting for your response.

yeah its a, roxism

he is on a bender, plucking strings somewhere

We need ScubaSteve in here to liven it up!

Rox,

What material are you using for the stand-off to hold the center piece in place?

Cheers!

Fulcrum

Click to view attachment
From posrt #261
"the attatchement was done with "patex". This is two component "glue" that after a complete mix is very strong and can work at high temperatures."