yes, i only use giesmann bulbs in my t5ho fixtures. shipping to this rock is astronomical to say the least, so i dont even bother with any other brand. i was happy with the first set i tried, so why mess around to save a couple of bucks. thats why i said "appears", doesnt mean its actually putting out more light as i dont have a meter, but it is my personal opinion comparing the two. i'm sure someone will do a test eventually to settle it scientifically.
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