The Nichia NVSU233A U365 is an ultraviolet LED that packs over one watt of power into a compact yet robust package. In our experience, it is one of the best UV-LED's available which is why we made a simple hand-solderable breakout board for it which you can optionally add as an accessory below.
This product radiates intense UV light during operation. It is intended for experienced makers only. Do NOT look directly into the UV light or even through an optical instrument. In case of light reflection during prolonged use, wear UV protective glasses to prevent eye damage for yourself and others in your surroundings. Here is a suggestion that is widely available online: Elvex UV Goggles.