Another low light shot, using 6 seconds exposure to make sure the lights show up. Further supplies of LEDs for lighting purposes turned up today from Maplin so another 5 locos have had their lighting systems updgraded. I'm using 3mm white LEDs (product code GV65V) with 680 ohm resistors (product code M680R) which is costing around £3.50 per loco.
If you think these lights are very bright, then look carefully at Class 67s or Freightliner 66s - model what you see. I've tried to choose a combination of components that give a prototypical look in sunlight, once you've got that you can further alter them using resistors or DCC CVs for a correct indoor appearance. This will obviously depend on your layout lighting.