[hahnmeister]

There are LEDs and T5 bulbs that are pretty similar to those curves. With good bulb husbandry, I think those spectrums are easiest to hit with T5s (LED's as well). Halides, not so much... unless you combine a 14,000Kish bulb with 420 and 460nm peaking T5s (blue and actinic). That gets pretty close.

Lucky for us, corals can photoadapt to an extreme extent (like humans adapting to eating tree bark), so as long as we 'try' to get close, they seem to pick up the slack. This 'photoadaptability' is no doubt due to the sessile nature of the coral once grown, but the fact that where it lands as as a 'spore' can influence what spectrums of light it may have to work with. Terrestrial plants can vary in elevation, position, etc... and the light spectrum doesnt vary a whole lot. 5m vs. 30m of depth in the ocean is like two seperate worlds, and that spore of acropora cant really get to be too picky where it lands. Sure, if its in a totally wrong spot, it wont 'set up shop', but beggars cant be choosers.