For a couple of built-in tanks I have done for friends, we just used a couple of simple round dish reflectors of the type that are sold for reptile tanks or photography studio lighting. They just sit on the top glass, and accept old-fashioned screw-in incandescent light bulbs...remember those? Then just buy LED "bulbs" designed to retrofit into old fixtures like this, available in various wattages and colours and quite inexpensive.
These can be had as either floodlights (wide beam) or spotlights (narrow) and they highlight a chosen area in the tank, and can be moved around to achieve the effect you like; with spotlights especially, they can produce some very dramatic lighting. They work nicely with specimen plants like Amazon Swords without encouraging algae growth on glass fronts. They run cool and cheap; they last practically forever, and best of all they produce that lovely "shimmer" in the tank because they are essentially point sources rather than full-width strips.
Cons? Well, they don't "forget" their programmed settings because they haven't got any! You turn them on and off yourself. If you want automatic operation, you buy yourself a simple or not-so-simple timer. They don't have variable dimming unless you provide it with your own dimmer control. They don't change colour or simulate lightning storms or moonlight, and they don't communicate with you via your cell phone when you are at work or on vacation...unless you buy the equipment that this requires.
They look awful, so they really need to be built in, either into a wall or within a fairly tall hood/cabinet unit.