Oh no doubt about it, HPS is definatly a higher yielding solution to indoor growing. Penetration is the key, I think we're all aware of that. And HPS has the penetration advantage over the T5s. If I had the money and space available I would go HPS without question.

But for some people, such as in my case, an HPS setup is just not feasable for a couple of reasons. After you factor in the amount of electricity ($$) being used for just a 12/12 flowering cycle you're looking at almost DOUBLE what a T5 fixture would run on 18/6. The heat issue alone in such a small setup is enough to make you not want to bother with it. 4ft L x 4ft W x 2ft D is just too small for an HPS lamp that puts out 20,000lumens. The bottom line is HPS gets expensive quick and the T5 HO fluorescents are the best bang for your buck.

So in the end sometimes you gotta work with what you got I suppose.

I bet I still get upwards of 2OZs dried off one plant.