Flowering with T5 for 4 weeks then switching to 600 w hps..

Will this work? I want to start a perpetual grow and working with a small area... I read somewhere, somewhere here that this is an ok Way to finish off a grow. Have limited amount of $ and just starting off.. piecing my equipment together from what I have.
Thanks in advance..

You will be fine. The yield might be a little less then it could of been but it wouldnt be anything to worry about. I veg with t5 but have been testing by keeping them under a t5 until the stretch is over (first two weeks or so) and the results are the same yiels wise compared to the whole flower cycle under a 600w.

Thanks for the reassurance...

Will changing the light in Flowering cycle make much difference? My 1st question from a T5 light to a 600w HPS light is more about saving $$ on equipment & utilities. But just saw some pricing and an electric ballast that is 1000w but has the dimming option. So I can go one step down for 4 weeks and then max it out the last 4 weeks. Any ideas if makes much difference in bud or about the same.