Are they T5 bulbs? If so, can you get tubes in the right light spectrum? 3000k may be suitable for bloom, but 2700k or lower would be better (for bloom). HPS lamps push high lumens (16000 at 150w) in the 2000k spectrum with a wider spectrum than CFL bulbs. Meaning, the distribution of light for HPS is more even surrounding 2000k (think bell curve) while CLF bulbs tend to have spikes near the stated color temperature of the bulb.
I was looking at a small T5 setup myself. You can get replacement bulbs/tubes in different spectrums (6500k for veg, 2700k or lower for bloom) pretty easily. I can't vouch for
this offer on ebay myself, but it looks to be interesting as the ballast seems to be able to take a Metal Halide or High Pressure Sodium bulb in 150w. Which means you can put the MH bulb in for veg, switch out for HPS for bloom. The wattage is right for an indoor, confined space and the lumens are pretty high!
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