Supplementing natural light

[ALToronto]

We're having the gloomiest winter that I can remember. Not only do we have about 6 hours a day of useful light, I saw sunshine twice in the last three weeks.

So even though my plants are in a south facing window, I feel the need to add more lights. I have set up an 8' (250 cm) track about 16-24" (40-60 cm) above the tops of the leaves, and I'm waiting for Ray's LEDs to arrive. In the meantime, I have a few high wattage CFLs to play with.

My question: how do I set up the 'on' times for the lights? I have a timer, and I can change it every day if I have to.

Here is my plant setup (lots more orchids on it now)