
Originally Posted by
ganjourno
The hortilux blue MH bulbs have essentially the same spectrum and output as the phillips mastercolor bulbs, but the philips bulbs are half the price. Another difference is that the phillips bulbs run on a conventional HPS ballast, whereas the hortilux blue bulbs run on MH ballasts. If you have to buy everything new for either scenario, they are a wash as the HPS ballasts cost more than the MH ballasts, erasing the cost advantange of the phillips bulbs.
Can't give you advice about the plantmax bulbs as I have no experience, but there is little difference in HPS spectrums unless it is a dual-arc lamp we're talking about.
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