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12-07-2009, 03:46 PM #1
 Class 4 Laser Join Date: May 2007 Location: Queensland, AU Posts: 7,549 Rep Power: 689
Things
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Bored? Why not crunch some imaginary numbers!

My friend and I were bored on IRC last night, and where talking about PWM LED controllers. I asked how many could be daisy chained together, then all the maths broke out. I compiled all the facts into a few lines, though. Pretty amazing

4096 PWM Chips
Control 65536 LED's
Which would draw 1310.72A
Which is 4kW of LED's
\$250 in PSU's
Which would cost over \$400K in LED's
216kW power draw @ 3.3V
Which would output 22.6 million lumens
Which would be an array of 3.2m^2
COntrolled by 4069 28PDIP packages
Which means soldering 113932 pins
The LED's would require jet turbine liquid cooling
And would output 67kW/m^2
Which means they would be 67 times brighter than the sun
Then, make it run off 18650's ...
Which would require 650kg of batteries, which could result in a 650kg lithium fire.
Put them all in series and you would have a string almost 1km long
It would take almost a month to charge the whole string, if you charged 20 for 1 hour
To charge them all at once would require a 3932.1A lithium battery charger
How about running it from button cells?
Ok well, that would require 330000 batteries, which would power it for an hour.
If you stacked them, you would have a tower 1.7km tall, and 660kg of button cells
So, to run the array for 1 day from button cells, it would require 3960000 of them.
Which equals about 7.9 tonnes of batteries per day.
What if you wanted to run it for a year? 2892718214.1 button cells of course!
Which would weigh 5 785 436.43kg
Wich would require 159 fully loaded semi-trailers to dump.
What happens if you end up putting a years supply of button cells in series?
you'd end up with 4,339,077,321.15 volts, or 4 billion volts!

12-07-2009, 04:07 PM #2
 Class 3R Laser Join Date: Jan 2009 Location: Illinois, USA Posts: 2,154 Rep Power: 173
iskor12
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Re: Bored? Why not crunch some imaginary numbers!

Wow...you have way to much time on your hands. but still it's neat to know these things

12-07-2009, 04:08 PM #3
 Class 4 Laser Join Date: Aug 2008 Location: Green Ridge,MO USA Posts: 6,929 Rep Power: 467
Mohrenberg
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Re: Bored? Why not crunch some imaginary numbers!

.....i did ALL of this a week ago, pfftt
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12-12-2009, 09:32 AM #4
 Class 2 Laser Join Date: Nov 2009 Location: Shelby Township, MI Posts: 324 Rep Power: 19
Drivinfast247
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Re: Bored? Why not crunch some imaginary numbers!

kind of interesting fact
Watts Up With That?: It's the Sun, stupid

12-12-2009, 10:01 AM #5
 Class 3R Laser Join Date: May 2009 Location: Panama City, Florida Posts: 1,838 Rep Power: 131
Gryphon
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Re: Bored? Why not crunch some imaginary numbers!

Cool! When can we see it finished
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I see................wait, what now?

(3x) 405nm
(6x) 445nm
(4x) 532nm
(1x) 543nm
(1x) 632.8nm
(1x) 635nm
(3x) 660nm
SSY-1 Laser

12-12-2009, 03:38 PM #6
 Class 4 Laser Join Date: Sep 2007 Location: Wisconsin Posts: 8,852 Rep Power: 1363
Cyparagon
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Re: Bored? Why not crunch some imaginary numbers!

I didn't see √-1 in there ANYWHERE. Those numbers are all real and you are a LIAR!

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