It would be cool to do this experiment setting up both lighting systems so that their output is equivalent in terms of PAR content. Then we could see differences in efficiency quite clearly. Shovelhandle stated that T5's produce more useable light if you mix bulb temps properly, and I'm guessing you could get better performance per watt with the t5s, but a direct comparison would be useful.
Chromophore Reviewed by Chromophore on . Will 150w HPS outperform 372w of T5HO? Well, I'm going to Find out! Only really applies to me and my particular grow, but a worthy effort anyway. A couple day's ago I put two under the T5's, and two under the HPS. I think the HPS at 150w is about 18,000 Lumen?...and the T5's are pushing 35,000 Lumen. I will throw a couple pics up when the "wakeup" tonight, should be interesting anyway. Predictions? Rating: 5