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QTX 4W 135mm UV Mini Tube F4 T5 BLB - Black Light

£199
The RRP is the manufacturer's recommended retail price of the item.
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Description

The QTX 4W UV mini tube is a 135mm compact black light source in the F4 T5 BLB format, designed for handheld currency checkers, portable inspection units and small-scale UV applications where space is limited. The tube measures 135mm long by 16mm diameter and emits ultraviolet radiation at 365nm with an output of 80µW/cm².

Designed for installation in mini fluorescent fittings with T5 sockets, the tube suits battery-powered handheld devices used for counterfeit note detection, forensic inspection of documents and ID cards, and mineral or fluid trace detection in maintenance work. The compact form factor allows manufacturers and installers to build UV inspection tools into spaces where full-size tubes cannot fit, including portable pest control lamps and small benchtop curing stations.

The F4 T5 BLB designation indicates this is a 4-watt tube using a T5 (16mm diameter) envelope with a black light blue phosphor coating that filters visible light while allowing 365nm UV emission. The 135mm tube length includes the metal end caps with bi-pin contacts, so the actual glass envelope is approximately 120mm. The tube operates on low-voltage ballasts typically found in mini fluorescent systems running on mains or battery power.

Specification
Diameter 16mmØ
Ultraviolet wavelength 365µm
Ultraviolet output 80µW/cm²
Length 135mm
Rating 4W
Type F4T5 BLB
Frequently Asked

What is this tube used for?

The 4W UV mini tube is primarily used in handheld currency checkers and portable inspection devices where compact UV illumination is needed to reveal security features on banknotes, passports, ID cards and documents. It also suits small pest control lamps and benchtop curing applications.

What does F4 T5 BLB mean?

F4 indicates a 4-watt fluorescent tube, T5 refers to the 16mm diameter (5/8 inch in traditional tube sizing), and BLB stands for black light blue, a phosphor coating that filters visible light while allowing 365nm ultraviolet emission.

What fittings does it work with?

The tube requires a mini fluorescent fitting with bi-pin T5 sockets spaced 135mm apart and a compatible low-voltage ballast. It cannot be used in standard household light fittings or directly on mains voltage without the correct ballast circuit.

How long does the tube last?

Typical lifespan for F4 T5 BLB tubes is 2,000-5,000 hours depending on operating conditions and duty cycle. UV output degrades gradually over the tube's life, so replacement is recommended when inspection performance drops noticeably even if the tube still glows.

Shipping & Returns

Free worldwide delivery

Free worldwide delivery on all orders over £99. International orders for third-party brand products may be subject to an additional courier surcharge based on volumetric weight, particularly on larger lighting fixtures — if a surcharge applies, our team will email you with the amount before dispatch and you can proceed or cancel for a full refund. See full delivery terms.

Returns

30-day returns window from delivery. As all our products are electrical or lighting goods, returned items must be inspected and recertified by a qualified electrician before resale — the cost of this inspection (25–40% of the item value) is deducted from your refund. Customers pay return shipping. Made-to-order, special-order and clearance items cannot be returned. See full returns policy.

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    Description

    The QTX 4W UV mini tube is a 135mm compact black light source in the F4 T5 BLB format, designed for handheld currency checkers, portable inspection units and small-scale UV applications where space is limited. The tube measures 135mm long by 16mm diameter and emits ultraviolet radiation at 365nm with an output of 80µW/cm².

    Designed for installation in mini fluorescent fittings with T5 sockets, the tube suits battery-powered handheld devices used for counterfeit note detection, forensic inspection of documents and ID cards, and mineral or fluid trace detection in maintenance work. The compact form factor allows manufacturers and installers to build UV inspection tools into spaces where full-size tubes cannot fit, including portable pest control lamps and small benchtop curing stations.

    The F4 T5 BLB designation indicates this is a 4-watt tube using a T5 (16mm diameter) envelope with a black light blue phosphor coating that filters visible light while allowing 365nm UV emission. The 135mm tube length includes the metal end caps with bi-pin contacts, so the actual glass envelope is approximately 120mm. The tube operates on low-voltage ballasts typically found in mini fluorescent systems running on mains or battery power.

    Specification
    Diameter 16mmØ
    Ultraviolet wavelength 365µm
    Ultraviolet output 80µW/cm²
    Length 135mm
    Rating 4W
    Type F4T5 BLB
    Frequently Asked

    What is this tube used for?

    The 4W UV mini tube is primarily used in handheld currency checkers and portable inspection devices where compact UV illumination is needed to reveal security features on banknotes, passports, ID cards and documents. It also suits small pest control lamps and benchtop curing applications.

    What does F4 T5 BLB mean?

    F4 indicates a 4-watt fluorescent tube, T5 refers to the 16mm diameter (5/8 inch in traditional tube sizing), and BLB stands for black light blue, a phosphor coating that filters visible light while allowing 365nm ultraviolet emission.

    What fittings does it work with?

    The tube requires a mini fluorescent fitting with bi-pin T5 sockets spaced 135mm apart and a compatible low-voltage ballast. It cannot be used in standard household light fittings or directly on mains voltage without the correct ballast circuit.

    How long does the tube last?

    Typical lifespan for F4 T5 BLB tubes is 2,000-5,000 hours depending on operating conditions and duty cycle. UV output degrades gradually over the tube's life, so replacement is recommended when inspection performance drops noticeably even if the tube still glows.

    Shipping & Returns

    Free worldwide delivery

    Free worldwide delivery on all orders over £99. International orders for third-party brand products may be subject to an additional courier surcharge based on volumetric weight, particularly on larger lighting fixtures — if a surcharge applies, our team will email you with the amount before dispatch and you can proceed or cancel for a full refund. See full delivery terms.

    Returns

    30-day returns window from delivery. As all our products are electrical or lighting goods, returned items must be inspected and recertified by a qualified electrician before resale — the cost of this inspection (25–40% of the item value) is deducted from your refund. Customers pay return shipping. Made-to-order, special-order and clearance items cannot be returned. See full returns policy.