Whoops..
The 16/8 was a typo..sorry about that.. Somehow forgot how to divide 24 by 4
Thanks for your comments.. It's all something to consider.. The impression I get from what you've said is that both work quite well. I think that I'll let the delivery date of the HPS light (supposedly monday..bah) and the availability of a timer to be my guide.
Thanks again. Any other tips are always welcome