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Registered Member #10
Joined: Thu Feb 02 2006, 09:45AM
Location: Bunbury, Australia
Posts: 1424
rp181 wrote ...
Do you have any long term intended goals for it? As said, 300$ seems a bit much just t play around with.
Nah - I just like shiny bright things. There is a certain geek cred with having the biggest LED on the block. If I want lighting I use my dual 500W halogens. I was hoping to focus this to give a LED that burns things. And I have a few more things in mind but I need a proper constant current driver that can have PWM and also audio input.
Registered Member #543
Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
Question from a semiconductor beginner: is there any merely theoretical limit to the size and output that an LED could have, or are the present limits merely economic?
Registered Member #10
Joined: Thu Feb 02 2006, 09:45AM
Location: Bunbury, Australia
Posts: 1424
rp181 wrote ...
I did see the spotlights in the picture above. How does it compare to a single 500W halogen?
Like this. LED on the left probably running about 75W. Looks brighter to me with a comparable beam coverage or better. I need to make a photocell lightmeter to compare these and also to look at the IR component with an IR filter.
Registered Member #162
Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3140
Since unlike a filament lamp which is slow to light modulate, how 'fast' are the blue-to-yellow phosphors? 'stroboscope' 'epilepsy-inducer' 'audio modulation' ? Any idea what the decay-time is ?
Registered Member #10
Joined: Thu Feb 02 2006, 09:45AM
Location: Bunbury, Australia
Posts: 1424
LED persistence varies from less than 1us to over a second. Turn on however is given as a fast 100ns.
Something I have to test for but should be good for audio and epilepsy generation which needs a few kHz down to a few Hz. Strobe stuff depends on a fast turn off but the big advantage is that is can generate a pulse of any duration, not just an instantaneous pulse. More on this later.
Registered Member #10
Joined: Thu Feb 02 2006, 09:45AM
Location: Bunbury, Australia
Posts: 1424
This photo shows the LED on the right in comparison with car headlights on high beam (100 W halogens each). Beams are very different but LED is easily brighter. Battery power might have been down to perhaps 50W here.
Registered Member #103
Joined: Thu Feb 09 2006, 08:16PM
Location: Derby, UK
Posts: 845
That's nuts... have you had it upto the full 100W yet?
Actually don't do that just because I mentioned it, I wouldn't want to be the reason it melted
It looks like the light is all 'spill', are there any optics you can get for it? It would make an awesome searchlight for example. I have one of those cheap '100W halogen bulb + SLA' torches which is impressive for about 5 minutes...
Registered Member #1497
Joined: Thu May 22 2008, 05:24AM
Location: Toronto, Ontario, Canada
Posts: 801
Inspired by and the lighting-stuff-on-fire gag they pulled, I have this one humble request.
Try to light some black paper with the *unfocused* light, I'm sure with the right lens you could burn anything with 100W of power, but I'd be more amused at a unfocused burn.
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Mother of all LED's
