Like almost any other plant, just give it as much warmth and sunlight as you can manage. There's really no mystery to most tropicals.

Water it when dry, allow to mostly dry out (not quite).

If you put it in a dark room it's almost certain to die.

Give it as much light as you can. They like excellent drainage. If they get too dry, the leaves will turn yellow and fall off, but will regrow. They don't like to stay soggy wet though. Mine blooms all winter.

If your foliage is still nice and green, you are lucky! They like a lot of light. I bring mine in every fall and treat them like houseplants. They drop a lot of leaves when they come inside. I think, for the most part, they just hate it. They limp along through the winter, then happily go back outside for the summer where they green up, grow, and bloom.

Tropical hibiscus are not meant to go dormant. It would probably kill them. My 30ish hibiscus send 8 months indoors every year and I rarely lose one. I stop fertilizing them when I bring them indoor and cut back on water. I give them as much sun as I can but you would be surprised to see how well they can do in limited light. The most important aspect in my opinion is watering. Overwatering kill more potted hibiscus than anything else I believe.

AS mentioned above, Give them bright bright light or the leaves and flowers will drop. Very little water over winter because they don't get sun like they did in June-Aug taking much longer to dry out pots. Let em completely dry out but not to the point where the leaves have wilted.

Lindsay, I think you may have me sold on the idea of a grow light! I've never seen one like that. Cool!