Was wondering if its possible to replace a halogen globe in an OHP with a self ballasted mercury vapor globe?
If it were possible it would sure fix 3 issues at once.
Brightness
Colour
Lamp Life
If it were possible it would sure fix 3 issues at once.
Brightness
Colour
Lamp Life
Except the color range of MV is unacceptable for this purpose.
In the real world, MH is used to power almost all the production LCD and DLP projectors; MV isn't used in any that I'm aware of. Must be a reason, eh?
In the real world, MH is used to power almost all the production LCD and DLP projectors; MV isn't used in any that I'm aware of. Must be a reason, eh?
google, page 2: http://www.aiacolorado.org/SDRG/div16/
Good technical comparison of the CRI and temperatures: http://plutarco.disca.upv.es/~jcper...ergy.arce.ukans.edu/book/sources/lampcomp.htm
More info on the differences: http://dscp103.dscp.dla.mil/gi/general/lightcat/geninfo.pdf
from: http://energydepot.com/carrollemc/library/LIGHT008.htm
That was just a few Google pages of searching.
Ultimately, it's up to you. On paper, the Fluorex bulbs are not suitable for this application either, but some people here are quite happy with them.
Good technical comparison of the CRI and temperatures: http://plutarco.disca.upv.es/~jcper...ergy.arce.ukans.edu/book/sources/lampcomp.htm
More info on the differences: http://dscp103.dscp.dla.mil/gi/general/lightcat/geninfo.pdf
from: http://energydepot.com/carrollemc/library/LIGHT008.htm
That was just a few Google pages of searching.
Ultimately, it's up to you. On paper, the Fluorex bulbs are not suitable for this application either, but some people here are quite happy with them.
I read the same pages on my google search.
But from the information I gleaned that the lights can be colour corrected to improve light output it the red spectrum and many globes come ready with UV filtering
I can see how theyre inneficient relative to MH in all regards but I still think they would be a great option if the self ballasted ones could be slotted straight into the original halogen socket.
Would allow someone like me to improve output from a halogen projector without a great investement of money and with little knowledge.
My guess is a lot of you out there started off with an LCD panel and OHP and then gradually got the bug.
If it works it another option to look at.
But can it be done?
But from the information I gleaned that the lights can be colour corrected to improve light output it the red spectrum and many globes come ready with UV filtering
I can see how theyre inneficient relative to MH in all regards but I still think they would be a great option if the self ballasted ones could be slotted straight into the original halogen socket.
Would allow someone like me to improve output from a halogen projector without a great investement of money and with little knowledge.
My guess is a lot of you out there started off with an LCD panel and OHP and then gradually got the bug.
If it works it another option to look at.
But can it be done?
OK, assuming that you want to use the MV...
I searched for a bit and could not come up with a self-ballasted MV lamp that came in a bi-pin version: they were all either meduium or mogul base.
All halogen-powered OHPs (that I'm aware of) use a bi-pin lamp, not a screw-based lamp. So it would not be a drop-in replacement. Rather, you would have to install a new bulb socket in the OHP. Which brings us to the next problem:
Size. The standard halogen OHP bulb is about 1-1/4" long, and comes mounted in an integrated elliptical reflector that is about 1-1/2" in diameter. I don't remember seeing dimensions, but I imagine that the MV lamps you are talking about are somewhere between a standard incandescent bulb and a standard 400w MH bulb. That's ALOT bigger, so you'd have to figure some way to either mount it inside the space intended for the small halogen bulb, or build a case extension for the OHP.
Last, you would probably want some kind of reflector to direct the emitted light through the apeture. There are several options out there, but they are all quite large, which almost certainly requires a case extension.
Taking this into consideration, I guess the point here would be that if you're going to do all the work that would be required to put a MV lamp in an OHP, you're one step away (ie add an external ballast) from having a more powerful MH lamp, so why not drop the $50 difference and double or triple the lumens?
OTOH, if you've located a drop-in bi-pin self-ballasted MV ENX lamp, gimme. I'll use it.
I searched for a bit and could not come up with a self-ballasted MV lamp that came in a bi-pin version: they were all either meduium or mogul base.
All halogen-powered OHPs (that I'm aware of) use a bi-pin lamp, not a screw-based lamp. So it would not be a drop-in replacement. Rather, you would have to install a new bulb socket in the OHP. Which brings us to the next problem:
Size. The standard halogen OHP bulb is about 1-1/4" long, and comes mounted in an integrated elliptical reflector that is about 1-1/2" in diameter. I don't remember seeing dimensions, but I imagine that the MV lamps you are talking about are somewhere between a standard incandescent bulb and a standard 400w MH bulb. That's ALOT bigger, so you'd have to figure some way to either mount it inside the space intended for the small halogen bulb, or build a case extension for the OHP.
Last, you would probably want some kind of reflector to direct the emitted light through the apeture. There are several options out there, but they are all quite large, which almost certainly requires a case extension.
Taking this into consideration, I guess the point here would be that if you're going to do all the work that would be required to put a MV lamp in an OHP, you're one step away (ie add an external ballast) from having a more powerful MH lamp, so why not drop the $50 difference and double or triple the lumens?
OTOH, if you've located a drop-in bi-pin self-ballasted MV ENX lamp, gimme. I'll use it.
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