Sunmaster - for serious growers, unmatched for resiliency, with very minimal loss of brilliance over its life time. The Super HPS (formerly Yellow Blossom) is best for flowering with its heavy orange-red content.
Buy multiples and save some $$$!
x 2 save $15 plus $5 on shipping
x 6 save $55 plus $15 on shipping
Compared to buying singles separately.