Correct angle for front light? I have recently invested in an LED front lamp with a battery pack. The results are great, it's incredibly bright and I will feel much safer with it on my bike.

However, I don't want to blind or hinder any other road users with how bright it is.

Car headlights are brighter but angled in a specific way, what is the correct angling (roughly) for a bike front headlight to maximise visibility whilst not impairing other road users?
Car headlights are more complex than bike lights. The beam is 'shaped' to throw light away from oncoming drivers and has a sharp cutoff on dipped beam. therefore bike lights will always cause a greater degree of glare (for relative brightness) than car lights. 

Point the beam so its shining at the ground about 10-20meters in front, and slightly towards the curb. The faster you go, the higher it needs to be. Curb side is where you need most light, as that is where the glass and rubbish is, and it avoids blinding oncoming motorists. As far as being seen, add a non-directional flashing light and hi-vis gear.