are a newer technology for growing corals. Thus they are expensive but can have great results. For one they do not produce the heat a mh
or t5 fixture would, they do not need to be replaced( ok only after 5 years but still), with the right LEDs you can grow whatever you want, they can penetrate 30" tanks with the right lenses, and they have a shimmer effect to them. led
fixtures are expensive($300 and up). A lot of people can make fixtures for around $250 from rapidleds.com. If I remember a 36-48 led
fixture with 3w blue and white LEDs will run around $280 for the parts.