Film-Tech Forum ARCHIVE: KINOTON FP 30 D LAMP CONVERSION

This is topic KINOTON FP 30 D LAMP CONVERSION in forum The Afterlife at Film-Tech Forum ARCHIVE.

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Posted by Nigel Pickles (Member # 6105) on 04-26-2015, 12:42 PM:

I have a kinoton FP30D Projector which i wish to fit a smaller lamp, it currently has a reflector in place & the 2000 watt lamp removed. I have managed to source a 400 watt 36 volt lamp, which I was told would be fine.
I'm having trouble achieving brightness, maybe I'm not positioning the lamp in relation to the reflector correctly??
Could anyone give me some advise or maybe a better lamp solution.
Nigel

Posted by Jonathan Wood (Member # 4614) on 04-26-2015, 02:14 PM:

Hi Nigel
You might have more luck posting this in the film handlers forum rather than this one. I did a very similar thing with an fp40 last year . If when u say 2000w lamp you mean a xenon in a proper 2k lamp house , then you will struggle getting a bright enough picture using the 36v lamp because the reflector is designed for axe on lamp where the 'hot spot' is right at the back of the reflector. Plus , you can't get the 36v lamp close enough to the film plane because of the shutter housing ; most of the light energy is lost inside the lamp house and only a small fraction makes it through the gate. I was experimenting with 650w AC lamps and even these struggled to get anything more than a pic a few feet wide . In fact an ELC 250w/24v lamp ( as used in most 16mm machines ) gave a brighter picture., the bottom line is it isn't about raw power in watts , it's about optical efficiency , and that 36v lamp as it is just won't do it. You could try the ELC lamp , it's built in reflector makes it more efficient than the 36v lamp , or you could get hold of an old 35mm slide projector , remove the condenser lens assembly and insert this into your lamp house with the 36v lamp in place and it might just work. Good luck

Posted by Nigel Pickles (Member # 6105) on 04-27-2015, 03:10 PM:

Thanks for that Jonathan, I Think the ELC 250w/24v lamp is my best option, I Presume it will have to be located closer to the gate compared to the previous lamp.Do you know what the ideal temperature at the gate and near the lamp should ideally be.There is a fan/blower already located at the rear of the lamp and blows straight through the hole in the reflector, obviously I will have to relocate this.
Cheers Nigel

Posted by Jeff Taylor (Member # 443) on 04-27-2015, 04:24 PM:

FWIW, 16mm designs using the ELC generally locate the rim of the lamp right behind the shutter which is generally not more than 1/4" or so behind the gate. You'll have to experiment a bit, but in a word it should be very close to the gate. Good luck.

Posted by Richard Fowler (Member # 893) on 04-27-2015, 05:22 PM:

ELH is a better bulb since it is usually used in slide projectors. It has a working distance 154.3mm (6 inch +) without a corrective condenser. Kinoton had a 400 watt / 36 volt lamp kit with corrective lens and reflector which would fit into the shutter housing.

Posted by Jonathan Wood (Member # 4614) on 04-28-2015, 03:46 AM:

Hi Nigel, as Jeff said you will need to get the lamp as close to the shutter as is safely possible . There will certainly be a substantial build up of heat and the shutter housing itself is likely to become very hot , so you will need to be wary of this. I doubt the fan in the lamphouse will do much so it would be wise to add another fan closer to the gate . I doubt the heat build up will damage anything , but you might want to the douser is ok as this will also be in the line of fire. I think your best option will be to use a lens/condenser arrangement with something like either the 400/36 DC lamp or a 650w/230ac lamp . Don't worry about flicker from the ac lamp , you won't see it. Jon

Posted by Jim Cassedy (Member # 4115) on 04-28-2015, 05:28 PM:

quote: Richard Fowler
ELH is a better bulb since it is usually used in slide projectors.

Just out of curiosity, does the ELH need forced cooling?

Posted by Richard Fowler (Member # 893) on 04-28-2015, 09:03 PM:

Forced air to keep bulb reflector temperature at 288 degree C / 550 degree F. Too much cooling will interfere with the tungsten - halogen cycle and will short the bulb life. I have built lamp houses for optical printers long ago and a proper sized muffin fan was O.K.

Posted by Nigel Pickles (Member # 6105) on 05-03-2015, 11:37 AM:

Thanks for the Info Guys, much appreciated.Is there any lamp on the market either mains or low voltage which I could use to make use of the existing reflector so as to keep the lamp house in an original state as possible??? Cheers, Nigel