They are no different from other LED's, just an older fanless design that you don't see around much anymore.
PAR38's and GU10's were popular when DIY LED setups were still a thing.
The rub is that since they are air-cooled they have to be designed properly or the system will overheat and lifespan wil be very limited. Not too many PAR38's were well designed; short life was basically an undocumented feature. (GU10's are much smaller, so easier to radiate the heat....quite reliable.)
Use a lux meter or PAR meter to gauge setup with either one and they should be fine at growing corals.
