slimpaq or and normal HO T5
 

Hello, just a question for a friend of mine.
He recently bought a Current USA 36" fixture and is wondering if his slimpaq bulbs are interchangeable with normal high output T5 bulbs. Any advice quick would be greatly helpful!!
He wants to buy a bunch of giessman bulbs thru a local group buy but needs to know if these bulbs are compatiable.
thanks