Yes except that would imply that current solar cells have an efficiency of at most 0.2%. Which isn't true. Maybe they are 500x more efficient in the UV, but in

Yes except that would imply that current solar cells have an efficiency of at most 0.2%. Which isn't true. Maybe they are 500x more efficient in the UV, but in that case it's a meaningless number because the Sun emits very little energy in the UV.