Infrared T-1 LED 880nm 130° SFH487P
Note Anode (+ve) is the SHORT LEG!
Vf = 1.5V
six of them light the test tunnel area quite well, at 100mA they are taking almost as much power as my camera - but sensible options all seem to be coming in around this value.
Infra-Red 850nm LED Star 950mW "Golden Dragon"
The Golden Dragon LED may be too powerful for lighting a 50cm tunnel, and even present a possible hazard... As 'IR illumination for cameras' is second on the list of applications to 'surveillance systems' I assume the H&S warnings pertain to 5A burst mode - I'll need to check this before I deploy one, but I'm picking up one to test.
Vishay LED IrLED 940nm PLCC
another wide beam IR LED with a reasonable output. Wavelength higher than the 880nm LED above, but SMT package less friendly
Vf = 1.35V
If = 100mA
Looking at current draw v performance, i'm going to stick with RS 654-8334. (All my notes are still in the loft where I tested them.)
For a rainy day;
I'm thinking I could try and knock the voltage down for the dragon with a switch mode regulator and not have to burn so much power off, but if the LED's i have are good enough it might not be worth it.