was hoping to pick anyone's brain about the best way to wire up 12 x 1w LED's (each one to its own output on the arduino board). I need led's with a fairly low viewing angle as they are going to be mounted into the base of clear acrylic pipes forming a 12 note colour organ - therefore I want there to be as least light bleeding between the different pipes as possible. I have been working on this project for a bit now and with the help of angry Mike and combatdave managed to get the midi side of the project working (i.e. being able to trigger individual outputs through a midi keyboard) I now need to wire in the correct brightness LED's, I was initially looking at other lighting options like 12v halogen bulbs and even PAR36 pin spots but none of them like being turned on and off repeatedly and both also have a short but noticable warming up and warming down period which would alter the desired effect i am looking for with this colour organ. LED's, especially the bright ones seem to be the ideal choice. I have come across these:
Description
- LED, SMD, DOME, 6 X 6MM, 1W, WHITE
- Colour, LED:White
- Luminous Intensity, Typ:42000mcd
- Angle, Viewing:60°
- Current, Forward If:350mA
- Voltage, Vf Max:2.8V
- Temperature, Operating Range:-40°C to +100°C
- Case Style:6mm x 6mm
- Colour, Lens:Water Clear
- Current, Peak Pulse:1000mA
- Depth, External:6mm
- Length / Height, External:4.8mm
- Lens Type:Dome
- Luminous Flux, Max:61lm
- Luminous Flux, Min:39lm
- Luminous Flux, Typ:52lm
- Luminous Intensity, Max:65cd
- Luminous Intensity, Min:39cd
- Power Dissipation:1200mW
- Temp, Op. Max:100°C
- Temp, Op. Min:-40°C
- Temperature, Storage Max:100°C
- Temperature, Storage Min:-40°C
- Termination Type:SMD
- Voltage, Vf Min:2.2V
- Voltage, Vf Typ:2.5V
- Width, External:6mm
from farnell and they seem the ideal solution - what i was hoping to get some help on is what would be the best way to drive them? another forum post mentions using 2N2222 transistors for driving bright LED's - if I got 12 of those, would that do the trick? anyone have much experience with this kind of set up, is heat going to become an issue?
any help is very much greatly appreciated!