what should i expect from a 100 watt hps

[BLaQLiGhT]

and can i use the hps from beginning to end

YES, you can use the the 100w HPS from start to finish. I have seen many Grow Journals on a different site were they used 250w HPS from start to finish and they had a really good harvest. Just put a timer on that thing and let them plants grow :thumbsup: ...