Well, I didn't think it was even possible, but I've improved my Lightbot score from 166 to 163. Managed to find a few more ways to do things with less commands. If you haven't seen the game here's the link: http://www.newgrounds.com/portal/view/
459508

And for those of you who are interested here's how I got a score of 163:

UPDATE: Now down to 162 with a quicker way to do level 6.
FURTHER UPDATE: Now down to 158 with quicker ways to do levels 7 and 8.

Key:
M = Move Forward
R = Turn Clockwise
L = Turn Counterclockwise
J = Jump
B = Light
1 = Function 1
2 = Function 2
- = No Functions

Level 1: 3 Commands
Main Method: M, M, B
Function 1: -
Function 2: -

Level 2: 9 Commands
Main Method: R, 1, 1, B
Function 1: M, M, L, M, M
Function 2: -

Level 3: 9 Commands
Main Method: 1, 1
Function 1: M, J, J, B, M, B, L
Function 2: -

Level 4: 10 Commands
Main Method: 1, R, M, 1, 1, B
Function 1: M, J, J, M
Function 2: -

Level 5: 11 Commands
Main Method: J, 1, M, 1, J, J, J, B
Function 1: M, M, L
Function 2: -

Level 6: 15 Commands
Main Method: 1, 2, J, 2, R, 2, 1
Function 1: M, J, J, M, M, B
Function 2: R, 1

Level 7: 13 Commands
Main Method: 1, R, M, R, 1
Function 1: 2, 2, 2, 2
Function 2: B, M, B, M

Level 8: 13 Commands
Main Method: 2, 2, 2, 1, 1
Function 1: M, J, M, B, R
Function 2: 1, L, 1

Level 9: 14 Commands
Main Method: J, L, J, 2, 2
Function 1: J, B, M, B, J, B, R
Function 2: 1, 1

Level 10: 21 Commands
Main Method: 1, L, J, L, M, 2, 2
Function 1: M, M, B, M, J, L, J, J
Function 2: R, J, J, 1, L, 1

Level 11: 23 Commands
Main Method: 1, J, R, 1, J, R, 1
Function 1: 2, 2, L, J, L, 2, 2, R
Function 2: B, M, B, M, B, M, B, M

Level 12: 17 Commands
Main Method: M, J, 1, 2, R, 2, B
Function 1: J, B, J, B, J, B, L
Function 2: 1, 1, 1