Yup, the higher the UV output, the great he florescence.
What are you going to shine the light on, just curious? Different materials have different optimal wavelengths of fluorescence and choosing the correct wavelength will be important.
Also, the higher the wavelength, the more visible the light will be to your eye, so it will distract you from picking up any fluorescence.
Check out LEDEngine’s UV emitter, but they are quite expensive but seems to be the only option on high output 365nm UV.