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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#41
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Converting a 200W discharge lamp video projector to LED
On 2/10/2013 6:35 PM, Arfa Daily wrote:
**BTW: This is the torch I spoke of: http://www.ozstock.com.au/8108/Super...able-Lens.html You may find one locally. It's a bloody rip-snorter. -- Trevor Wilson www.rageaudio.com.au I'm glad it's "Plash resistant" and has a "Tactical switch". They should be useful features ... ! :-) **What are you going to do? Spelling is not what it once was. One of my regular buyng sites is a very large Aussie retailer. It appears they employ copywriters whose first language is not English. Seriously though, it is a somewhat different design to ones that I've seen previously, so may be a considerable improvement. It does seem to be a technology that's evolving quite quickly. Arfa **Indeed. Here is where I get the some really nifty torches: http://dx.com/ A nice aspect of the site are the uncensored reviews of their products. Delivery is slow, but free. This is an immensely impressive torch: http://dx.com/p/ultrafire-th-t60-ha-...-x-18650-57007 It does us special LiIon batteries though. About 3 Bucks each. The special charger is another 6 or 7 bucks. These things are astonishingly good: http://dx.com/p/12w-7000k-800-lumen-...p-12-14v-80512 Almost twice as bright (measured with a light meter) as an 11 Watt T5 fluoro lamp. They must be glued to a small flat piece of aluminium heat sink, but, even then, they are exceptionally compact. I've purchased dozens of these. I cannot recommend them more highly. Awesome product. My neighbour uses them in his camping trailer. And here is the 100 Watt LED emitter I purchased: http://dx.com/p/jr-100w-w-100w-9000l...-30-36v-173825 It requires a separately available 3 Amp, constant current source. Easily replaces one of those 500 Watt halogen work lights. -- Trevor Wilson www.rageaudio.com.au |
#42
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Converting a 200W discharge lamp video projector to LED
Supplied in small numbers , the lenses are supplied pushed into the
mounts and again they don't say how to remove them without damage to the lens. First one bodged by placing over a couple of metal plates providing the across-flats 12.9mm gap to then push down as detailed below. As stated previously you lock the holder to the pcb in normal use, by pushing the lens into the holder , so first they have to be separate. Then with 1 free holder, place back-to-back castellation to castellation over the next one. Place a flat piece of rubber into the slot part that takes the LED (so not to damage the thin lens wall) and push down quite hard with a rod, until the lens pops the 1mm into the precise recess of the other holder. Remove the second holder by hand and then grip the lens across the pre-existing mold marks and pull out from the first holder with serrated edge pliers. Well that is my method for Osram Golden Dragon lenses made by Polymer Optics Ltd as supplied by RS |
#43
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Converting a 200W discharge lamp video projector to LED
The focused 7 cell honeycomb lens came together well. Doing the maths
and having a wedge tapering to .3mm seemed ok but trying to adapt plastic to those sorts of dimensions is not practical. Having to mould my own mounts. The 2700K LEDs are noticeably cream yellow colour to the eye and seem to have supressed the blue peak, too much? Relative intensity through a dicroic colourwheel R 340 G 270 B 070 even the reflection off the blue filter, ie complement colour of yellow , is noticeably brighter than the reflections off the R and G sections. I was expecting to add 5mm red LEDs but looks as though it will have to be blue ones. Won't know for sure until the video projector has a reasonable block of time to get inside to mess about. |
#44
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Converting a 200W discharge lamp video projector to LED
As my mouldings to fit LED to lens are egg-cup shapes , a 3 part mould
required, letting epoxy harden before running off 7 of them, so far so good. I was impressed with just trying one LED at 1/4 power of 90mA (no heatsinks yet) and 5 feet away , bright enough to read by just. Add a lens at the correct position and a neat bright foot by foot "pixel" , of the chip thrown on a screen 5 foot away, probably as bright as the projector showing white (DLP losses unknown). So 7 of them and 4 times as bright would illuminate a 5 x 4 foot screen , with that brightness. If 50% loss in hte projector then add another ring of 6 , room in the "funnel" reflector for them if required. I wonder what a gobo type thing made of a matrix of single RGB LEDs , with lens arranged to throw foot x foot squares with 6 inch overlap , would look like if driven with graphical/animated "video" pulses |
#45
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Converting a 200W discharge lamp video projector to LED
any more on this? any luck?
would love some pics to see the progress |
#46
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Converting a 200W discharge lamp video projector to LED
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#47
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Converting a 200W discharge lamp video projector to LED
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#48
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Converting a 200W discharge lamp video projector to LED
pics etc on later thread, titled
Converting discharge lamp to multi-LED for video projector (maybe) |
#49
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Converting a 200W discharge lamp video projector to LED
On Mon, 24 Mar 2014 00:49:00 -0700, N_Cook wrote:
..snip... I assume you've seen the pics URL'd here. Single compound LED built around a 5 inch ball valve float. Mark2 would be 19-1 built around small christmas bauble as basis. The central lens not having an LED but used to pass light from a similar cluster behind it which also has a cluster behind it. As long as the light falls in the well of one of those lenses then its collimated to about 3x3mm focus, ie within the light tunnel entry aperture just saw this thread. back in the 70's while visiting Varian in Palo Alto, CA I met the inventor of the xenon arc light. He was looking for other applications than 'tank' lights for this formidable light producer. He had mounted it inside a 16mm projector to replace the 'hot' bulb presently used. The projector spread the movie images over a 20 ft wide screen in the brightly lit lab, yet the film was easily viewable in that light! and the blues were incredible. and you could freeze frame WITHOUT burning a hole in the film. That arc light is also used in medical applications down tubes for lighting endoscopy, etc. and in microscope platforms. I think the arc light is available commercially at several places, incuding those outlets like Edmund Scientific. It's a small cylinder with ring contacts on front and back. I have one somewhere it's approx 1.5 inch long by 1 1/4 diameter has a builtin reflector for throwing the light forward. From memory the arc, once fired runs on something like 10A at 12Vdc, or so. But the light can be used on your off road vehicle to see a mile ahead [again from memory] and having no filament, quite robust. Not so much to distract your efforts, but worth looking at. Oh, one down side. The light is so bright it creates ozone across the surface of the bulb. and ozone and the aluminum parts in the projector didn't get along so well. But still alternatives to think about. |
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