As to the lighting issue, back when I got my last anemone I still had only 80 watts of light, poor thing got as small as a golf ball, when I installed the 380 watts of VHO lights it grew to the size of a softball and has now split the 3rd time giving me 4 BTA's.
If you have standard fixture then you will only be able to support standard or Normal output lighting.
In the case of the VHO very high output, it requires a special ballast, with VHO bulbs. A two to four lamp fixture with ballast could cost you around $150.00 to $180.00 or so dollars, and thats without bulbs at around $22.00 a piece +or-...
When an anemone has a meltdown it literally disintigrates and fouls the tank,dies, and could depending on the toxins released kill your fish.
I would watch your ammonia, nitrites and nitrates daily for a few days as well as watching your anemone while the lights are on, and immediatly in the morinig when you wake. If you susspect that he is melting away you may need to remove it so that it does not harm the rest of your tank.
No need to panic just keep an eye on it. and let us know if anything changes.
Thomas