You want my opinion on this matter?
I've tried a few different lights from full spectrum 36w LED's, 12w plant LED's, arcadia stretch marine, arcadia stretch tropical, 6500k white led strip, Aquael Leddy 15w LED Daylight and i always seem to go back to the 1w Ikea LED. Why? its a simple 6500k warm white, wide angled led, that fits perfectly where i need it to go.
Put it simply, a 6500k white does the job well, if not better than any "grow bulb". If i could use the arcadia stretch on this sump i would as its nice and slim and doesn't get in the way.