light help

Found some hating on mars hydro 300 true watt. grower diaries did seem suss, salesmanish, inawethentic n not sure why. Is it really crap at flowering? Anyone tried one? Worried i #@ed up on light purchase. Is something like this 3000k 480w or 720w claimed true draw LED any good...

So I happened to over sleep on my 4 3 week old plants. And left them dark for 9 hours compared to my usual 6 hours of darkness. Will this cause a problem if I jump back into my regular cycle of 18/6 or is it at the point where they will flower. ....I have reason to believe they are a sativa...

http://www.htgsupply.com/products/growbright-4-foot-8-lamp-high-output-t5 vs https://www.amazon.com/dp/B002TJKS8Y/ref=cm_sw_r_cp_apa_15jzybK8H23R8 looking to grow 3 plants with 6400k for vegetation and 3000k for bloom.