Plenty of research on the net and look at images of good tanks and then see what lights they run with.
Don't be fooled by reviews, even ones that have written statements saying that they are unbiased. I have some LED lights that you can't (as far as I am aware) get in the USA. The vast majority of the reviews don't rate them that much and especially not for a deep tank. Only one review that I have seen has been on the whole complementary. I have 4 of these TMC Aquaray lights on my 60X24X30 (Total cost less than 1 AI Sol blue) and 1 cheap and nasty chinese import t5 lights......2X39 Watt tubes.
So my lighting, although temporary (all be it longer than anticipated), is according to any reviews or 'this is minimum requirement' articles, a load of rubbish. In less than a year some of my leathers have grown 300%, my torch, hammer and frogspawn are all immensely happy, thriving and growing on the bottom of the tank.
AI Sol Blue are according to many people.....the dogs danglies compared to cheap chinese rubbish. The owner of one of my LFS has both and they are identical apart from the body! Maxspect razor.....They had to send one back for repair but the manufacturer is not sure exactly which factory in China made that particular one. they change suppliers for particular parts as the prices change........They are not assembled in one factory from start to finish.