This is something a lot of people have been trying to find; where can we find information on doing a setup with metal halide. What items do you need (i.e. ballast etc.) and what do they do. Where can a compleate kit be bought, or where can the parts be purchased individually. This fourum should be all about metal halide lighting...
I have been looking at this light
http://www.elights.com/phil400watme.html
But have no clue how to make it work?
I have been looking at this light
http://www.elights.com/phil400watme.html
But have no clue how to make it work?
I agree. This forum needs more topic specific threads. 3000 posts in parts 1 and 2 is ridiculous. I was looking at that site and it looks promising. I got two qestions to add:
1. What is so special about the Philips lights? Would a 400W Philips bulb be better than a 575 non-Philips MH bulb?
2. What is the best color temperature to look for? Simple question but I can't seem to find an answer.
1. What is so special about the Philips lights? Would a 400W Philips bulb be better than a 575 non-Philips MH bulb?
2. What is the best color temperature to look for? Simple question but I can't seem to find an answer.
Projector light bulb color
I am not sure which color is good for projector light.. I guess anywhere between 3800 to 6000 K should be good.
I am not sure which color is good for projector light.. I guess anywhere between 3800 to 6000 K should be good.
Re: Projector light bulb color
Ok, I found it somewhere else on here. 5500 is the magic number.
rajkumar said:
Ok, I found it somewhere else on here. 5500 is the magic number.
Hi,
What is the difference between single ended and double ended metal halide bulb ?
In the upper post, you said 5500 for temperatur color is the best for DIY LCD projection but I can't seem to find any 400 watts bulb with 5500 K ?!
thanks for help
What is the difference between single ended and double ended metal halide bulb ?
In the upper post, you said 5500 for temperatur color is the best for DIY LCD projection but I can't seem to find any 400 watts bulb with 5500 K ?!
thanks for help
Metal Halide bulbs generate very little heat
Halogens and incandescents burn a filament, which generates mostly heat, and releases photons (light) as a biproduct. You can see why these generate alot of heat.
Metal halide's on the other hand do not burn a filament, and therefore do not get very hot. You should have no heat problems if you hook up a regular computer case fan to your projector box.
Halogens and incandescents burn a filament, which generates mostly heat, and releases photons (light) as a biproduct. You can see why these generate alot of heat.
Metal halide's on the other hand do not burn a filament, and therefore do not get very hot. You should have no heat problems if you hook up a regular computer case fan to your projector box.
Heat equals power. Temperature in not the same, ashes from a cigarette is aprox. 500 degrees, but you can catch it with your hand without burning it.
All bulbs produce as much heat as the power they use. Only a tiny fragment of all used power is converted to light.
A 400W halogen will produce as much heat as a 400W MH, but the MH will produce more light.
btw: the inside of a MH bulb is 1000 degrees C hot (plasma arc).
All bulbs produce as much heat as the power they use. Only a tiny fragment of all used power is converted to light.
A 400W halogen will produce as much heat as a 400W MH, but the MH will produce more light.
btw: the inside of a MH bulb is 1000 degrees C hot (plasma arc).
That's because it is relatively small amount. If it is 2 tons of 500C ashes... you are probably fine if you use your fingers to "squeeze" a match flame off, but you don't want to do that to a burning touch.
that why we want high efficient bulbs
total_energe = energe_of_light + energe_of_heat from a bulb
I don't know how much more efficient a MH bulb is than a halogen bulb. but I do know that 40W fluorescent tube is warm but a 40W normal light bulb is hot to touch, while they use the same amount of energe. so if MH is more efficient than Halogens, I think it will be cooler. but again if the difference is like difference between 1% and 2%, then we wont be able to tell.
Thanks for the answer.
But if I understand correctly, the more efficient the bulb, the more light and the less heat. So why not use High Pressure Sodium bulbs? I did a little research, and they produce high lumen (100 lumen/watt), life of 20,000 hours, cost about 30-40$ each, color temperature is poor (around 3200k) but the white HPS bulbs make 4000 K. The bulb heat temperature goes up to 450 C, but rapsac says the arc of MH bulbs is 1000 C... I don't know if its comparable.
But if I understand correctly, the more efficient the bulb, the more light and the less heat. So why not use High Pressure Sodium bulbs? I did a little research, and they produce high lumen (100 lumen/watt), life of 20,000 hours, cost about 30-40$ each, color temperature is poor (around 3200k) but the white HPS bulbs make 4000 K. The bulb heat temperature goes up to 450 C, but rapsac says the arc of MH bulbs is 1000 C... I don't know if its comparable.
How about this as the solution. Its a HPS to MH conversion bulb. It puts out 33,000 lumens at 5200K, 90CRI and has a life of 20,000 hours as seen here . It also has the benefit of being a T15 bulb so it is nice and thin so you can cool it better and fit it into tighter spaces. At 40$ i couldnt find a better MH bulb so all i need is a HPS ballast
A good resource for spectral images of metal halide and HPS lamps. Resource is in Russian, but images are self-explanatory:
http://www.msaqua.com/html/aqua/lamps/spectra/spectra3.htm
http://www.msaqua.com/html/aqua/lamps/spectra/spectra3.htm
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