Kapten Capsaicin said:
There is no reason to buy expensve HPS lamps when CMH lamps gives you a better spectrum for much less.
last i checked CMH bulbs are very expensive, and low wattage.
i considered a trio of 75w CMH fixtures once, for a living room with like a 15' vaulted ceiling. the bulbs were quite pricy,
and their efficiency was also pretty damn low, 70ish LPW? it was like around what a high quality florescent ballast can give.
CMH lighting is gerogous, IMO probably the best lighting for landscape/outdoor lighting period, right now atleast.
do they even make CMH bulbs over 400w yet?
but ill take wattage+ efficiency anyday.
with respect to starting plants... i dont think that the emphasis on color quality yields anything other than marginal results.
where as a more efficient bulb, as HPS can get over 100LPW, will yield more light with less heat etc. the result of this is less than marginal.
growing a plant out to fruition, is another story, and something ive done under HPS, bot not a halide, so IDK perhaps its worth it in that case.