That's not true at all really. There are some high quality "Blue" tubes that put out a BOAT load of PAR and can promote some amazing growth. It also depends on the specific coral. Some coral are "designed" to utilize more blue light than others because they come from deeper waters. White light is a combination of ALL light colors at once. Many coral aren't capable of utilizing the Red and similar spectrum of colors because those are the ones filtered out by the water first so anything from deeper water may not be able to use those colors.
It really comes down to the individual bulb specs rather than a general "color" especially when we're talking T5's.
They have MAJOR differences but it's really hard to compare ALL T5's with ALL LED! It also is hard to compare because most of us running LED are running them in such a way we can control the COLOR of the tank which could be affecting growth as well. Take my RSM130D tank. I'm running it in a more "BLUE" configuration simply because that's the look that pleases ME the most. By doing this I'm not running all of my LED at PEAK power so in essence I'm selling my coral short on growth in order to achieve the LOOK I want.
Now keep in mind saying "
That's what I've been hearing. Growth is important to me. I want massive basketball sized corals!!! " has it's own set of problems. Many of us want that at least initially but the fact of the matter if you can get too much of a good thing. A huge "blah/drab" looking coral may not be as eye pleasing as a small to medium colony that has spectacular colors. There is a lot more to lights than just picking a single color and going with it. Not all coral like all light.
