Dimming lighting upgrade; sunset, sunrise and clouds

I received my new dimming ballasts yesterday. Replacing the stock ballasts is quite simple and can be done without damaging the RSM, so all modifications can be reverted. I used 5 dimming Philips HF-Regulator 254 TL5 EII 220-240V 50/60Hz ballasts. That's one for every 2 TL5's, which enables me to control 5 independent channels with a standard 1-10V (1-100%) interface. The Profilux is controlling these lights:

L1 = front section first two TL5's
L2 = front section second two TL5's
L3 = mid section two TL5's
L4 = back section first two TL5's
L5 = back section second two TL5's

L1 is leading and L2, L3, L4 and L5 are following L1 with 15 minutes interval. That way the sun will rise in the front of the aquarium and will set in the back. The Profilux is also simulating clouds, so the lights are fluctuating a bit to get more realistic lighting.