Doinging a little google searching will get you your answer to halogen. That answer is a NO to those. Halide will get you your color spetrum needed for corals. I run T-5 lighting on my 90g works great for SPS corals i even have a CORCEA clam which requires high intesety lighting. all are doing very well. Currently the way to go is either T-5 or metal halide. the spectrum i run is 12k most people run between 10 to 20k on the spectrum with 15k being the mid point. for a 46g tank either t-5 or metal halide will work.