QTX UV Black Light Bulb B22 20W - 365nm

The QTX UV black light bulb is a 20W compact fluorescent lamp with a B22 bayonet fitting, producing 365nm ultraviolet light to activate fluorescent and UV-reactive materials. The twin-tube design delivers UV output in a form factor similar to a standard energy-saving bulb, fitting most B22 lamp holders without requiring specialist fittings.

Designed for party lighting, stage effects, retail displays and decorative installations, the bulb works by emitting ultraviolet radiation in the 365nm range, which causes fluorescent dyes, paints, fabrics and plastics to glow visibly under otherwise low ambient light. The effect is most pronounced in darkened rooms where the UV output is the primary light source. The B22 bayonet fitting allows the bulb to be installed in standard UK lamp holders, table lamps, floor lamps and pendant fittings rated for 20W or higher.

The 20W rated power consumption is lower than traditional incandescent black lights, reducing running costs for extended use during events or permanent installations. The bulb operates on standard 230V 50Hz mains supply without requiring ballasts or control gear beyond what is built into the lamp base. The black glass envelope filters out most visible light, allowing the UV component to dominate the output and create the characteristic purple glow associated with black light effects.

What materials glow under this UV bulb?

The 365nm wavelength activates fluorescent dyes in certain fabrics, paints, plastics and papers. Common items that react include white clothing (which contains optical brighteners), tonic water, some highlighter pens, UV body paint and purpose-made fluorescent decorations. Not all white or light-coloured materials will glow — the effect depends on the presence of fluorescent compounds.

Can this bulb be used in any B22 lamp holder?

Yes, provided the lamp holder is rated for 20W or higher and operates on 230V mains. The bulb fits standard B22 bayonet sockets found in UK table lamps, floor lamps and pendant fittings. Avoid using in enclosed or poorly-ventilated fittings, as compact fluorescent lamps generate heat during operation.

Is the UV output safe for skin and eyes?

The 365nm wavelength is at the long-wave end of the UV spectrum (UVA), which is less harmful than short-wave UVB or UVC. However, prolonged direct exposure to any UV source can irritate eyes and skin. Use the bulb for decorative effects rather than as a primary room light, and avoid staring directly at the lit bulb.

How long does the bulb last?

Compact fluorescent lamps typically last 6,000-10,000 hours depending on usage patterns. Frequent on-off cycling reduces lifespan, so the bulb performs best when left on for extended periods during events rather than being switched on and off repeatedly.