Yes, the right LED
fixtures are worth it. They are more potent than Halides and still give you the shimmer folks seem to love. Under the right fixture, you can grow anything you want. 3 halides at 550 watts? that doesn't add up. Are you adding in your actinic supplement?
So, I'm guessing you have 150 watt halides. The difference will be night and day.
There will be virtually no heat, no bulb change, and less electricity used.
You will have to acclimate your corals very carefully however. LEDs may seem as bright as halides, but they penetrate the water better.