Hi
I am a novice at heart so not too cluey on setting up a circuit correctly.

This is basically what im doing

Im setting up a bunch of IR diodes to a car system (12VDC)

i just need to know what/how many resistors i need and how to setup the circuit. Im pretty sure ill be doin it in series too

the specs of the IR diodes

size: 5mm.
Voltage: 1.5V-1.6V.
Wavelength: 850nm.
Current: 60mA-120mA.
View Angle: 15-30 degree.
Lens Colour: Water Clear.
Emitted: Infrared light LED

Any help would be appreciated, thanks!

 

That is rather vague - like how many might constitute a "bunch"? 850 nm is a bit hard to see - what is the point?

 

there will be 20
i need it to go around the border of a sign.
I wasnt sure if 850nm or 940nm would be brighter, in the day picked up on camera.

 

Hi
Voltage: 1.5V-1.6V.
Current: 60mA-120mA.

Remember that a car's charging circuit can result in your "12V" as being anywhere from 11.8V - about 13.8V maximum.

Considering the current specs they're fairly forgiving, you can put 8 or 9 in series directly to a 12V supply and they should hold up fine.

Individually you'd want to use somewhere between 120 - 240 ohms in series with each LED.

 

there will be 20
I wasnt sure if 850nm or 940nm would be brighter,

Depends on the peak wavelength response point of the camera.

If you can go with 24 that would be three strings of 8 with no resistors, if not then set it up as 8, 8 and use around 68 - 75 ohms in series with the last series set of 4.