LED white light = 2 1200 watts

Thanks for your comment. I am trying to replace a 1200 watt oshram BRN lamp currently being used for a high speed film printer. The issue is that we have field problems that show on screen. Each lamp lasts about 3 months at a cost of about $26-$35 per lamp.

There has to be a better alternative. I need a range of exposure from 780nm in the Red 680 nm in the Green and 500nm in the Blue.

Any thoughts??

I think eman is specialist of this side, he can offer you a solution.

but your parameter of color wave length is not right.

maybe you reversing red and blue.

The logic is there but 780nm is a bit long, that is going to infrared.

you are right.

The filament area of a BRN lamp is about 3/4 by 3/4 inches, more or less. You'll not find an LED array having this intensity in such a small area, even with the highest-intensity LEDs presently available, and certainly not with a single LED that would better suit the projector's optics. The technology simply doesn't exist yet.

Hi Edward,

Does your company manufacture these printers? If so, and as you control the design, you may wish to consider using high-pressure xenon short-arc lamps for your light source. These bulbs last far longer than the typical 20 hr life of BRN type bulbs. The down side of xenon short-arcs is that they require a well-regulated DC power supply that can handle the peculiar needs of these high-intensity lamps and so, for your application, the cost may be excessive. These bulbs must also be handled carefully, as the pressure inside the envelope can exceed 50 atmospheres. Being arc lamps, xenon short-arc lamps will not have the same color-temperature of BRN bulbs (3250K). They also produce a lot of UV and IR (about 10% of the output is in the IR region of the spectrum), and so they may not suit the particular needs of your printer without additional optical filters. You'd be the best judge of that.

Short arc Xenon lamps are now often used as light sources for commercial film and LCD projectors. Color-correcting filters would be available (at least on order) from suppliers. Lamp-houses and power supplies for these lamps would be available from the manufacturers. The major drawback to short arc Xenon lamps is their high price.

Metal halide lamps are widely used as light sources for consumer LCD projectors, so they are widely available. They give you nice, white light, but are very costly to replace.

With a proper condensing system, multiple white LED's could provide an extremely intense source of light, but you need somebody who knows his (or her) way around optics to design this beast. Since the light output of individual LED's is small, many would be needed, and the initial cost would be high. They would also need some color correction. Most white LED's produce light with a bluish cast, although some are yellowish. Good luck.

the most power of led I know is only 10W unit.

so much power output needs many leds and large size, cannt satisfy with his requirement.

filter and sink dont be a prolbem , I think as well.

You can get a 60W led but they are expensive. Try www.alibaba.com type in high power led and you will see a range of high power leds that are available. hope this helps.

Is the 60W led a single chip unit?

thanks at hte same.

It will not be the simple change of the lamp: high power white LED is not a simple white led but a group of different colored leds and a regulating device that checks the color and drives the different groups.

In a projector this would result in the red info of you spot not ending up with the green and blue info.

you will have to revice the complete optical path of your printer.

A white LED can be built this way, but most LEDs advertised as "white" are made using a blue LED with a yellow phosphor coating. The combination of blue and yellow produces white light. The color temperature of the LED is controlled by ratio of blue and yellow.

I think you should visit the lamp manufacturing websites apart from your original supplier osram look simens , philips ,GE they may offer solution .LED`s have long way to go in that segment

E-man is right. none has such power lamp of led in the world now.

you may hope to get 1200 led and each one has 2w ppower?

halogen lamp can cate to you. cheap and same color temp.

There was this recent thread about white light laser:

http://cr4.globalspec.com/thread/5790/How-to-build-a-white-light-laser-using-fiber

It may give you, if not the total power, the required power density.

In this thread Vermin has given some explanations of its workings (cladding dopants) but I understand Bragg reflectors in the video. This may be caused by my telecom FBG background.

Try ENFIS, they make high power LED light engines complete with thermal management that may suit your needs.

Bubbapedi has said most I agree with and understand from experience. I know cameras and lights better than I do lights for printers so it is common for me to Gel Lights to get the correct color temperature for the shot. Any color correction Gel can come as well on glass and you can combine for instance Diffusion, with CTO, or CTB to say make Tungsten Light to "White Light", or the opposite. Osram is an experienced company and in your position I would ask them what to do to make your printer work better. I'd be surprised if they weren't thinking about it. Frankly your Lamp costs sound very reasonable to me. I imagine your "Field Problems" coming more towards the end of the life of the Lamp.

As far as color correction gels I used Lee, Rosco, and Great American Market gels, and much liked Lee, but have to admit that GAM has really come on strong with certainly superior diffusion and party gels.

1200 watts for a printer implys you are printing at the same speed the 500fps camera was running, that camera that just has a slit instead of a shutter. From what I know of lights you would probably need a good deal of optics to focus LEDs for your purpose and this may be why a simple strong beam is more standard.

That Xenon mentioned really is something to consider, though I wonder a bit about your printer and its optics, and whether or not they are taking advantage fully of what lamp Osram has created.

I am very fond of the French lighting company LTM, and recommend you give them a call to see what they say as well.

This LTM?