Yes im expecting that, all I think the difference is between these UV LED’s is the amount of true “UV” light emitted.
Im not sure what exact UV wavelength(s) cause fluorescence, but technically it is the invisible part such as UV B or C.
Or else blocking the visible “blue” part of the UV spectrum would make the glass fluoresce less bright if it has any effect?
The ’502 got a generic 385nm-395nm LED drop-in.
I got a black UV S2+ and just transplanted its pill into a violet host, sticking in a ZWB2 filter while I was at it.