I would get hortilux. I <3 dual spectrum.instead of hortilux how about;
AgroMax 600 watt HPS Bulb
This bulb is perfect for people using 600 watt High Pressure Sodium systems. It offers an extremely high output of 95,000 lumens. Standard 600w HPS bulbs only emit 80,000 lumens. Its spectrum is also made specifically for plant growth with an additional 30% more "blue" spectrum over standard HPS bulbs. More "blue" spectrum means the bulb has a more complete light spectrum equating into better/more plant growth. This is a specialty horticultural bulb designed and manufactured for plant growth!
SunMaster 600w HPS Bulb
This is a premium SUNMASTER Brand high output spectrally enhanced horticultural bulb. This 600 watt High Output HPS bulb emits 95,000 lumens - standard HPS bulbs which emit only 88,000 lumens. Perfect for 600 watt HPS grow light systems This bulb gives you a higher light output which equates into faster / more plant growth and ultimately higher plant yields.
which do you think?
these are the bulbs i am using, they came highly recommend here, and my local shop. The super HPS seem reasonalby priced and they perform as described.I would get hortilux. I <3 dual spectrum.
SUPER HPS grow lamps fine-tune your lighting system to provide optimum spectral energy levels that promote vigorous plant growth. The EYE Super HPS EN Grow Lamps provide 17% more total energy and 25% more energy in the violet, blue, and green spectrum than standard High Pressure Sodium lamps.
Its basically the only bulb the hydroshop will sell me. He swears by these. I definitely notice the blue spectrum compared to my son argo.these are the bulbs i am using, they came highly recommend here, and my local shop. The super HPS seem reasonalby priced and they perform as described.