The entire Current Orbit Marine
Pro line up run leds at just over 0.5 watts. Their own webpage has a chart that lists how many total leds and how many watts each fixture has and the are all just a bit better than 0.5 watts per led.
http://current-usa.com/aquarium-led-lights/orbit-marine-fixtures/orbit-marine-pro/
They can work, but the deeper your tank is, the less PAR you'll see. At 24" you'll be keeping mushroom corals. And that's running it at full power. If you have a 10" to 18" deep tank, you'll have better luck. But why buy weak leds? Just because they have all the fancy electronics to do sunrise/sunset? IMHO you're better off buying better light (3 watt leds) with less options.