I don´t think you have to cool the reflector so very much, the reflector is made to handle very much heat, the orginal 75-100 halogen thing in the middle of the PAR-reflector gets much warmer than a 150W HQI-bulb. I think the only fan needed is a fan that pull the warm air out of the pj-case.
But I think the main reason to use a PAR30 design is that it is cheap and easy to find part for. They have PAR30 bulbs with a coollight reflector in all lampsshop, but you have to ask for it.
A PAR-design use all light you can use from the bulb, and we need all light we can get!
I bought a commercialprojector yesterday, I couldn´t resist, the price was only what you pay for two 15" tft monitors, and that unit is marked with 800 Ansi-lumens, and it´s much much brighter than my DIY-projector even with the PAR30-design, so a DIY-projector will not be brighter than mayby 150-200 Ansi-lumens as most even with a 250W bulb.
But I think the main reason to use a PAR30 design is that it is cheap and easy to find part for. They have PAR30 bulbs with a coollight reflector in all lampsshop, but you have to ask for it.
A PAR-design use all light you can use from the bulb, and we need all light we can get!
I bought a commercialprojector yesterday, I couldn´t resist, the price was only what you pay for two 15" tft monitors, and that unit is marked with 800 Ansi-lumens, and it´s much much brighter than my DIY-projector even with the PAR30-design, so a DIY-projector will not be brighter than mayby 150-200 Ansi-lumens as most even with a 250W bulb.
hmmm u might want to bring that up with cruser as his is totally watchable in the day, his must be about 800-1000lm i recon, anyway about the reflector, to me i think the parobolic design u have is the best for the cdm-t bulb, the reason why is because the cdm-t's center arc tube is ceramic, no light can pass through it when using a spherical reflector as its not clear, using a parobolic in the type u have chosen is the best for that bulb as the light from its sides can get freflected forward, in the spherical its blocked when the bulb is at the focal point as the light cant pass through the ceramic center, so realy your reflector is the best and the reason above is 1 reason why its brighter, the other reason is because of the reflectors shape and size, it can capture nearly all of the light at this size there fore giving us a gain of light output, as for the cdm-t being used on a shperical reflector u cant run it at its focal it must be off set either in or out of focus to get the best results so the light can pass under or over the ceramic arc tube, now with a 250w hqi they have clear arc tubes, the spherical reflectors on these work wonders as the reflected light can pass though the arc tube, u wouldnt get much gain with a paroblic reflector of this design on a 250w hqi, being only the light that isnt captured by the shperical reflector caught by the parobolic, then u would also have a problem with a double ended bulb as the socket would cause u a shadow in this configeration, the best reflector to use is an elliptical, they arent cheap and hard to find, only then we will be able to use 90% of the light source, so realy i think for a cdm-t setup the parobolic setup u have designed mathis is the way to go, and for the 250w hqi the spherical is the way to go.
As for the heat it will be very hot, anything that filters or absorbs ir will take the heat, that reflector will get nearly as hot as that bulb after a couple of hours use so an adequite cooling system would be required, thats somthing thats easy to over come with abit of common sence and the right design structure.
Trev
Very true and so are condensers but that reflector will heat other things up, just like a condenser does, anything metal conducts heat so what u mount that metal too will get the heat from the metal mounting holding the reflector, a cleverly designed metal heat sinking frame would be the go to remove the heat from the source.
Trev
ace3000_1 said:
I didn't know that the source of such tubes (HQI-TS and CMD-TS)
where not clear, thank you for telling. (I had almost bought a spherical reflector).
About the heat disposal:
What about taking a metal grid:
An externally hosted image should be here but it was not working when we last tested it.
like this and use it in this way:
An externally hosted image should be here but it was not working when we last tested it.
Ok we have to find a way to block the light going up.
Can somebody read what they are doing here on this site?
The pictures look nice and could give us some information about the reflector.
http://homepage2.nifty.com/bozushi/Hid/Haikou/Haikou.htm
The pictures look nice and could give us some information about the reflector.
http://homepage2.nifty.com/bozushi/Hid/Haikou/Haikou.htm
Mathias I think you hit the jackpot with your par design. look at this profesional lighting (disco) equipment:
From this site:
http://www.inter-son.fr/scn800hqi.html
An externally hosted image should be here but it was not working when we last tested it.
From this site:
http://www.inter-son.fr/scn800hqi.html
hmmm maybe my new idea will too lol mathias do u have msn messenger? i want to talk to u about this.
nice post AL by the way, maybe we could use a stainles steal funnel to make a wider spot beam for a reflector.
Trev
nice post AL by the way, maybe we could use a stainles steal funnel to make a wider spot beam for a reflector.
Trev
Well guys here is some info on reflectors, no doubt u would know it and have seen it before, as u see the sphericals can be used as a parabolic if the light source is at half of its radious, now what im going to do is atempt lol to drill a 22mm hole in a large sperical reflector for this cdm-t bulb, i think it will work and the reflectors sure as hell have the right coatings so it should reflect alot more light then when it was used as a spherical.
http://www.awi-industries.com/relectors.html
Trev
http://www.awi-industries.com/relectors.html
Trev
This is a picture of the UHP-lamp unit in my commercialprojector, surprising they use normal plastic around the lamp and in the lamphouse, so I really wonder if the heat is a such big problem.
Ace if you want to talk about the reflector, please mail me, I don´t use msn (Icq is much better, Microsoft always try to copy things and destroy them).
Ace if you want to talk about the reflector, please mail me, I don´t use msn (Icq is much better, Microsoft always try to copy things and destroy them).
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The Alchemist said:
so my question is: where do we get such a high reflective reflector like this one in the picture the alchemist posted?
that was my thought too; don't they melt at the heat the lamp produces? i would like to have reflector like that, but unfortenately the reflectors are not sold seperately :-(
http://www.mega-licht.de/115951.pdf
and as far as i know this things cost a fortune
http://www.mega-licht.de/115951.pdf
and as far as i know this things cost a fortune
here is a shop selling them
http://www.photolampen.de/fiberoptik-lampe.html
goto Metalldampflampen
the last item at the bottom of the page --> 125€
http://www.photolampen.de/fiberoptik-lampe.html
goto Metalldampflampen
the last item at the bottom of the page --> 125€
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I don´t really know what you mean ?
The reflector is made of steel and it wont melt, the bulb used in those lamps is a 55W halogen and that bulb will be very hot.
I payed €15 last summer for that lamp. Buy two of them if you are going to take one of them apart. But yes it is not so cheap for a reflector.
mathias
most torch lights reflectors are made of plastic, sorry i was unware yours was a halogen search light, infact its the first that ive seen being a haologen.
Trev
P.S i installed icq to chat to you but it seams either you are too busy or you dont get my messages.
most torch lights reflectors are made of plastic, sorry i was unware yours was a halogen search light, infact its the first that ive seen being a haologen.
Trev
P.S i installed icq to chat to you but it seams either you are too busy or you dont get my messages.