how do you run 132 leds off a 1amp power supply? It would take 3 amps if you ran them all individually (with their own resistors). If you ran them all in series, it would only take 20 mA, but would require a 462+ volt power supply! (3.5v * 132).
if the leds are 20mA, which from my browsing most are,
it would take a 3amp power supply to run them. (132 x .02A=2.64A)
My Light Fixtures are made up of groups of 3 LED's. Each group has its own current limiting resistor to limit the current to 20mA per group. There are 44 groups of 3 LED's for a total of 880mA. There are actually 4 strings of 33 LED's, or 11 groups of 3 LED's. Each string uses 220mA. A "string" is a 1/2inch wide strip of balsa wood with the LED's glued and wired to it.
At 12 Volts, the best you can do with White or Blue LED's are groups of 3. With Red LED's, you can wire 5 of them in series. In series, their voltages add, so at 3.5volts the most you can hook in series is 3.
Can someone supply me with a parts list and possiblyFor 200 LED's, you will need a 1.5A or 2A power supply.
the formulas to justify the specific parts (resistors, power supply...)
1.5A Wall Wart
3A Table Top
For the LED's, the least expensive place to buy them is eBay.
The guy from Hong Kong is the brightest and the cheapest. But he rips you on the shipping and it takes 2 weeks. You also may get screwed. I placed 3 orders and on one of them I ordered 300 LED's but only received 100. The other 2 orders (500 LED's) were fine. But, if you need a lot and you want them cheap, he's the only game in town.
mckenkenken is a bit more expensive but he's reliable and ships fast. If you only need 200 LED's, then you might want to go with mckenkenken.
To calculate reistor values, see here:
I got my Light Fixture idea from Project X's Fish Tank Light Bars. I expanded upon John's Light Bar concept to go from 9 LED's to 132 LED's! Instead of using PCB's, I just glued and hardwired the LED's and resistors to strips of Balsa Wood.
Attached is a schematic and a couple of pictures. I just quickly took the pictures so they are a bit blurry. I'll be taking better pictures for posting on my Web Site in a couple of days.
GAP Development Company