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There is a professional home automation system for this that I use called Clipsal C-Bus. You use can use a 4 channel dimmer and drive it using the Light level sensor. It automatically adjusts your light brightness accordingly to suit the varying lighting conditions around you, to maintain a constant level. This will also save you power when the room is bright (by dimming your bulbs or dimmable fluros). With this device you can additional "ramp" the light on or off over a period of time to simulate sunset and sunrise. But cheap - I don't think so.
Roughly $1,000.00 later for the parts, you then need someone one who knows Cbus to program it for you. And sorry, but I'm in Townsville.
So yes, there are plenty of other ways. This is just one from a professional level, but sounds like the fish tank light could be a cheaper answer if it'll work for you.
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