These are part of my low cost range of 1 watt power LED emitters. They are rated at 400-405nm and a recommended current of 350mA. They are supplied ready to go on a standard star PCB, just attach them to a suitable heatsink and you're done.
Forward current: 350mA continuous
Forward voltage: 3.3 - 3.6V
Wavelength: 400 - 405nm
Beam angle: 120°