I've used (250w DE)
-14K Hamilton, really really love the colour, crisp white, touch of blue, but had a couple of bulbs burn out after a month, other after 6 months.
-14K Ushio, find rather yellow, maybe little more growth the the Hamiltons
-20K XM, way to purple, not long enough to comment on growth
-ordered 14K Pheonix today, hoping same colour as the Hammys
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