8 bulb Sunpower is $560. 8 bulbs is $200. So $760 and will use 192w with zero control except for on/off. Annual bulb replacement is $1000 over 5 years at current pricing. You’ll also need to factor in ballast replacement. Say only one goes bad in 5 years, that’s another $50 and hours of your time.
6 bulb Sunpower is $500 plus $150 in bulbs. So $650 and will use 144w. Annual bulb replacement is $750 over 5 years at current pricing.
3 Blades (2 grow and 1 glow) is $650. Uses 120w. No bulb replacement and no ballast replacements. Maybe a power supply goes bad. No idea the cost but let’s say $50 like a ballast. 10 minute swap.
5 year cost to run each:
8 bulb - $1810 plus electric
6 bulb - $1450 plus electric
Blades - $700 plus electric
Yep, when you actually compare like for like the Blades are over 50% cheaper.