QTX 36W 4ft T8 Fluorescent Black Light Tube - 365nm UV

The QTX 36W 4ft black light tube is a T8 fluorescent fitting emitting ultraviolet light at 365nm wavelength with an output of 80µW/cm². The 1200mm length and standard 26mm diameter fit T8 tube holders in larger UV installations, replacing worn tubes in existing pest control units, currency verification systems and fluorescence effect displays without requiring new fittings.

Designed for commercial and industrial UV applications, the tube provides UV coverage across a 4ft span for pest monitoring traps in warehouses, banknote authentication in retail environments and glow-in-the-dark party effects in entertainment venues. The 36W rating draws standard mains current through compatible ballasts, maintaining consistent UV output over the tube's operational life.

The 365nm wavelength sits in the UVA spectrum, causing fluorescent materials to glow visibly under the black light while remaining largely invisible to the human eye in normal lighting conditions. The 80µW/cm² output delivers enough UV energy for clear fluorescence reactions without the higher-intensity hazards of shorter-wavelength UV sources. The T8 format is the most common fluorescent tube standard in UK commercial installations, simplifying replacement and spares logistics.

What fittings does this tube work with?

The tube fits standard T8 fluorescent tube holders with compatible 36W ballasts. The 26mm diameter and 1200mm length match the common 4ft T8 format used in UK commercial and industrial installations. Check the ballast wattage rating before replacing an existing tube.

Is the UV light visible?

The tube emits primarily 365nm UVA light, which appears as a dim violet-blue glow to the human eye in dark conditions. The UV wavelength itself is largely invisible, but fluorescent materials exposed to it glow brightly in visible colours.

What applications suit this tube?

The 4ft length suits larger UV installations including pest monitoring traps in warehouses and food storage areas, currency and security marking verification counters in retail and banking, and fluorescence effects for entertainment and party displays.

How is UV output measured?

The 80µW/cm² figure measures microwatts of UV energy per square centimetre at a defined distance from the tube surface. Higher figures indicate stronger UV intensity, though safe UVA sources like this 365nm tube remain well below the output levels of hazardous UVB or UVC sources.