Mars use less efficient epistar diodes and cheap drivers on their ts and sp series, spider farmer and many others use the more efficient lm301b or h diodes and have meanwell drivers. For a cheap qb I’m liking the bloomspect ss1000, $69 on amazon right now. Meanwell drivers, Samsung lm301b and an 1/8 or 3mm heat sink. Just my 2cents, oh and I’ve had 8 ts1000 drivers fry on me in the last 6 months.