After looking at your method of calculation I'd recommend that you just use a faster photopolymer with your standard lamp and projector. Something like this:...
8327
luis h
luisguillermo98
Mar 4, 2013 3:32 pm
Hi Torben, I have heard good thing about the Chinese led, I have seen them in youtube and they are very bright. According lo some articles LED produce...
8328
luis h
luisguillermo98
Mar 4, 2013 3:41 pm
Arthur, Are you referring to .5 watt/cm² watts per square? Luis...
8329
luis h
luisguillermo98
Mar 4, 2013 4:04 pm
a high power 100watt LED can produce almost 12000 lumems and they last 10000 hours or more so we are getting fast curing and the bulb will last for years.. LED...
8330
Graham Stabler
eexgs
Mar 4, 2013 4:20 pm
I can absolutely imagine LEDs being the future however they will be far more suitable as the size of the source reduces for a given power output, the 100W LEDs...
8331
luis h
luisguillermo98
Mar 4, 2013 4:52 pm
I have seen a single Height power led of 100 watt no more than 2" across. I think http://www.ledengin.com/ has one for 50 watt in a very small package but...
8332
Graham Stabler
eexgs
Mar 4, 2013 6:04 pm
... Exactly, 2" is absolutely huge Graham...
8333
bobgarrish
Mar 4, 2013 7:13 pm
A Tesla is a coal** powered car, not very efficient at all compared to a Tundra. I do agree with the logic, though, that you can do some really neat things...
8334
torben.mogensen@...
torben.mogen...
Mar 4, 2013 7:23 pm
To anyone interested in using UV LED projectors Converting an LED projector for DLP printing in more tricky that bulb projectors, mainly because its not been...
8335
torben.mogensen@...
torben.mogen...
Mar 4, 2013 7:31 pm
A 24 element array is Ø12mm and will only "just" fit into the space available in and 300 lumens type of projector. A 24 element produces 12.700 mW and...
8336
Francis Leach
francis_leach
Mar 5, 2013 3:41 pm
Gentlemen Graham was kind enough to make the point that only a point light source is projectable via lenses. I have 3D modelled a suggested UV light source...
8337
luis h
luisguillermo98
Mar 6, 2013 12:08 am
I mentioned the electric car becasue an electric motor is 70% more efficient than gas engine one. If the electricity comes from coal that is a different story...
8338
luis hernandez
luisguillermo98
Mar 6, 2013 5:21 am
Here is some LED from 10 to 100 watt.. http://www.youtube.com/watch?v=LGaP-ZXFRdE...
8339
luis h
luisguillermo98
Mar 6, 2013 5:26 am
Torbe, Has you tried the LED yet?. By the way, there is a good manufacturer in Taiwan that supposedly match the quality of USA led manufacturers but half the...
8340
luis hernandez
luisguillermo98
Mar 6, 2013 5:47 am
Does some one knows what value is read by the lighmeter? http://www.youtube.com/watch?v=dBFlXeRRYe8...
8341
luis hernandez
luisguillermo98
Mar 6, 2013 5:54 am
This is a 100 watt LED in action. The heat sink use is too big for a dlp projector but there are very powerful ones in smaller package but if it does not fit...
8342
Graham Stabler
eexgs
Mar 6, 2013 9:22 am
This shows so clearly that they are all basically the same LED element made in to larger and larger arrays, the energy density is the same for each so as you...
8343
Francis Leach
francis_leach
Mar 6, 2013 10:11 am
Graham I take it that you are reinforcing the point, that the loses will be significant and the more desirable solution is to concentrate the light down to a...
8344
Graham Stabler
eexgs
Mar 6, 2013 10:25 am
Ah yes sorry Francis, I did see your post but did not reply because I simply don't know how well it will work. The main applications of simple light guides I...
8345
Graham Stabler
eexgs
Mar 6, 2013 10:34 am
I've just noticed that the same site sells fused fiber image conduits at REALLY low prices (Edmund is 4X as much for 1"), these are 50um fibres fused into a...
8346
arthur2shedsj
Mar 6, 2013 12:15 pm
Please pardon my ignorance here. Why all the hubub about LED's when you can use a standard DLP projector with only a slight modification to the lens (close...
8347
Graham Stabler
eexgs
Mar 6, 2013 12:32 pm
Lamp life would seem one factor and a potential speed boost. But as you say the layer separation is the bottle neck and Torben wrote about that very fact. As...
8348
Jon Elson
jmelson2
Mar 6, 2013 5:22 pm
... The problem with fibers is they spray light out the end in a wide cone. I think it typically is around a 30 degree per side cone. Each fiber of a fiber ...
8349
Graham Stabler
eexgs
Mar 6, 2013 5:29 pm
The idea previously mentioned some weeks ago was to heat and stretch the fibre bundles to create an intensification effect and to have one bundle per LED with...
8350
surfer15a
Mar 6, 2013 9:42 pm
Hi Luis, Fernando makes excellent resins and is an excellent source of info during the development of a resin/project. He licenses his formulas to Ron (both...
8351
arthur2shedsj
Mar 7, 2013 12:21 am
Glad to hear it. I was starting to think that this is a group grounded in popular opinion vs math and scientific facts....
8352
Graham Stabler
eexgs
Mar 7, 2013 12:47 am
Although one should remember that many group members are here for the fun of it or to learn about topics for hobby purposes and are not necessarily trained...
8354
doyle_arthur@...
doyle_arthur...
Mar 7, 2013 1:51 pm
Lamp life, to my view, is the only benefit that can be gained by using leds....
8355
arthur2shedsj
Mar 7, 2013 2:26 pm
The other issue we have run into is the waste heat converted by a lamp. Compact designs require lots of airflow to keep the electronics cool. The heat may also...
8356
Craig P
texmaster_us
Mar 7, 2013 2:55 pm
http://www.stumbleupon.com/su/2sQDAn/inhabitat.com/uc-berkeleys-dreambox-3d-printer-vending-machine-dispenses-your-designs-before-your-eyes/ a new vending...
