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Hi, It's Tan's hubby here. I think there a few "do it yourself" ways to do this. An obvious one that comes to mind would be to us an Arlec light sensor that you get in the garden section (for garden lights) from Bunnings or somewhere. You may need the garden transformer aswell (to power it), but instead of running 12VAC garden lights with it, you run a 12VAC relay with 240V contacts (which you get from somewhere like Ideal electrical or Laurence & Hanson) and wire the contacts the opposite way around. So instead of the lights turning on when it gets dark, the relay (connected to your daylight bulb) will turn on when it gets light!
Aletrnatively, if you were electronic minded, you could make one with a Jaycar kit - part number KG-9090 for about $20 and substitue the relay for your 240V one.
Or even if you were to be happy to settle for mimicing the dark instead of the light, you simply need only to buy part number PS-4074 $20 from Jaycar which is a Bayonet fitting that plugs into your existing light socket, and automatically only provides power to your bulb when it is dark, and turns off again when it is light.
Hope this helps.
Corie
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