Another option often forgotten or ignored these days is the floodlight type LED bulbs available (referred to as PAR 38 which is the form factor & has nothing to do with light measurement). Pretty basic & may not be everyones cup of tea that likes controllers, dimmers & all the bells. But they can be installed like any household bulb, heatsinks, drivers etc. built right in. I believe they're up to 12 or more 1 watt or stronger LEDs per bulb now & many more offerings designed for marine tank use colour wise. Still semi DIY since depending on tank size & number of bulbs you need for coverage, you'll need to have enough light sockets wired close to your tank to handle all the bulbs.
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