But if you are growing weed seriously (ie, all year round) there is no difference in the advantages for you versus a commercial greenhouse. Actually there is a greater need for the hobby grower using hps as primary lighting cause you run your light more hours than a commercial greenhouse in secondary lighting.

From the calculations I did you would pay these things off in a year or 2 depending how much you pay for power. So even if they are more expensive the hps it would make sense to switch.



Quote Originally Posted by hyperman
They are not targetting indoor grower with this product, but commercial greenhouses who have thousands of HPS lamps. For these people, the price difference will easily be absorbed by the economy in electricity consumption and not having to change the bulbs every 1-2 years. And since they are only using the lamps as a supplement, they don't need a full spectrum, but instead target the most "efficient" wavelength (deep 660nm red with a little bit of "royal blue" 450nm) for photosynthesis.