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Topic: LED projector bulbs ? on the way.
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Pere Pasqual
Film Handler
Posts: 43
From: Gandia, València, Spain
Registered: May 2017
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posted June 20, 2018 01:51 AM
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If you disassemble them, sure...
Of course, my idea is to try whatever it works. I counted on that from the beginning. Among other reasons because there would be no way to fit a full-sized flashlight inside a projector without disassembling it. My idea is to permanently replace the original bulb without further notice or annoyance for the user, and to connect it to the tension/current source for the halogen bulb.
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but your not going to get anywhere near the light output you will need. That "Lego Projector" is only projecting a few feet. Try projecting 20 feet...
Again, that project is from 7 years ago. LED lightning has evolved in an undescriptable way since them; you cannot compare. You have plenty of models claiming to output thousands of lumens for the price of a halogen bulb. Even if the real amount of light is fake and roughly half the stated, and considering that some percent of light is wasted due to unproper focusing, etc., now we have far more "light power" than 7 years ago.
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But I can see you wont believe me until you see it with you own eyes. So go head and give it a try. I hope you prove me wrong because I would love to have an LED conversion...
I'm determined to at least try the flashlight mod. It looks like the cheapest and easiest attempt. And I don't want to bother or anything. It's that my curious mind finds the urge to at least make some attempt. Of course I confide in your vast experience, Adam, and I'm really taking it into account. It's just that I don't want to give up yet.
My 1st problem now is to decide between the vast amount of models and prizes. That needs some time. Any recommendations welcome!
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Pere Pasqual
Film Handler
Posts: 43
From: Gandia, València, Spain
Registered: May 2017
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posted June 28, 2018 10:56 AM
I think this is getting out of control.
Yeah Lee, maybe thos LEDs are wonderful, but I think we don't need to go that far. I've found another video of another person who modded an old projector into using a flashlight:
https://www.youtube.com/watch?v=cNE1qBmWfWY
The description says that he's getting more light compared to the original bulb. And, again, that video is from 2014. We are in 2018 and technology has evolved considerable since then regarding LEDs and flashlights. What's seen in this video looks fairly easy to accomplish, and by using a 2000+ "claimed" lumens flashlight I think we should expect at least half that, nearly equal to the halogen rating.
Anyway, I already got one of those flat cheap 10 W LED and plan to attempt some experiments during this weekend. Moreover, I've asked for help in a Spanish LED flashlight forum (there are a number of these on the internet) and I've got already some valueable info. Take a look at these ones:
https://www.fasttech.com/products/0/10031707/7281007-cree-xhp50-2-j4-5a-2654lm -4000k-led-emitter
https://www.fasttech.com/products/0/10032925/7492701-22mm-3000ma-1-mode-dim mable-led-driver-circuit
The 1st one is an XHP50.2, and yeah, these are not "fake" lumens, but "real" ANSI measured ones; the 2nd one is an inexpensive driver which should work with out projectors' bulb 12 V input. The only missing piece is a fan and, maybe, a lens. After some quick googling I found that they at least seem to exist and are suitable for this model of LED, with really narrow beam angles. I have yet to find where to buy them, but let's got step by step: 1st with the flat 10 W LED, then with the XHP50.2 without a lens, and see what happens.
Last but not least: looks like out-of-the-box ready replacements are starting to make their appearance. I cannot remember if we've already talked of these ones:
https://es.aliexpress.com/store/product/Hi gh-lumen-CREE-MR16-LED-spot-light-AC-DC-12V-6W-9W-12W-15W-COB-High/210139_32301397267.html
The one from the left seems almost the needed amount (they say it's a proper replacement for 70 W halogens, and claimed to produce nearly 900 lm), but some kind of of mod should be done in order to mount them inside a projector as there are longer. But you can see they are from the proper connection and tension (12 V DC), and look like our old friend dichroic ones with their and properly "condensed" light beam. They deserve a try at least.
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Pere Pasqual
Film Handler
Posts: 43
From: Gandia, València, Spain
Registered: May 2017
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posted June 29, 2018 06:18 AM
Don't worry, Lee. Of course I understand the purpose of your message, and it's very important to be aware of the current state-of-the-art available techonology.
That said, my goal is to try to get results with the already, afordable, available technology, which I suspect is more than enough to achieve, at least, the same performance that with the old halogen bulbs.
I've gone one step forward from my previous message and, instead of trying with XHP50.2, I've already ordered one of these:
https://www.fasttech.com/p/8894801
That's a Cree XHP70.2 6500K LED, capable of outputting up to ¡4292! lumen, with an emitting surface of 7x7 mm, which is slightly more than the size of a 5.79 x 4.01 mm super 8 frame dimensions. Even with a loss of, let's say, 50% light (to exaggerate things to a extreme worst case), that should clearly outperform the lumen amount of an halogen. I've already found 5º narrow focusing lenses on eBay suitable for these type of lead (my goal was to try to use 3º ones, but haven't found any of these yet). I'm not sure if they will be really needed, but due to their cheapness I want to try them anyway to see if it makes a difference.
Now it's just a matter of time to get them and try.
Adam, have you tried any of these leds already?
PS: this is the companion driver I've also ordered
https://www.fasttech.com/p/7217304
which, with it's maximum of 4500 mA, should deliver a bit less than the theoretical maximum rating, but plenty of them anyway.
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Pere Pasqual
Film Handler
Posts: 43
From: Gandia, València, Spain
Registered: May 2017
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posted July 02, 2018 02:47 AM
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That lamp looks like it has a lens on it already
I think it's not a lens at all; they call that a "dome"; apparently it's featured in most led chips, and it seems to have some effect in the "halo" or difussion of the projected light; in fact, I've seen they sometimes apply some "mod" to them called "dedoming" - looks like they get some extra amount of light by doing this. But who knows - I haven't investigated it deeply (and probably won't do).
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I have tried several Cree drivers/LED clusters much brighter than what is mentioned here including several flashlights. Unfortunately most of the light does not make it through the film gate. You will need some sort of reflector to capture and redirect the light. I have tried several but have yet to find the right combo.
Maybe the difference is that what I'm attempting here is not a cluster, but a single chip, nearly the size of a 8mm gate, which claims to deliver the stated amount of light. That makes a difference from the usual cluster/array of leds.
And also, as I've said previously, I've ordered a 5º lens also. Looks narrow enough to me. I'm not sure if I can use both a lens and a reflector at the same time with this arrangement. I'll see when I have it in my hands.
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It may be more efficient to build a external light box where you can work with the brightest LED cluster and feed the projector with a two foot fiber optic cable
No idea on how this works. I think this is completely out of my scope...
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