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  • New item   Fluorescent Lamp T5 | G5 | 8 W | 4000 K | 460 lm | Tungsram TUN T5 8W 840
    New item   Fluorescent Lamp T5 | G5 | 8 W | 4000 K | 460 lm | Tungsram TUN T5 8W 840 1

    Fluorescent Lamp T5 | G5 | 8 W | 4000 K | 460 lm | Tungsram TUN T5 8W 840

    Code: 41947
    Barcode: 8714681441947
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    Tungsram TUN T5 8W 840 – a compact T5-type fluorescent lamp with a G5 base, made using Triphosphor technology for stable, even light output. Designed for standard lighting luminaires and high-frequency emergency lighting systems where a neutral white 4000 K light is required. Used both in continuous lighting and in emergency mode, where the lamp operates under low-power conditions.

  • Product description

    Fluorescent Lamp T5 | G5 | 8 W | 4000 K | 460 lm | Tungsram TUN T5 8W 840

    Tungsram TUN T5 8W 840 – a compact T5-type fluorescent lamp with a G5 base, made using Triphosphor technology for stable, even light output. Designed for standard lighting luminaires and high-frequency emergency lighting systems where a neutral white 4000 K light is required. Used both in continuous lighting and in emergency mode, where the lamp operates under low-power conditions.

    Key idea:
    In an emergency lighting luminaire, the lamp must run equally reliably from the full mains supply and from a low-power battery reserve – not every T5 lamp is built for that. The Tungsram TUN T5 8W 840 is designed specifically for this dual duty: the triphosphor coating maintains light quality even at reduced power, while the compact 288.3 mm length fits narrow modular and emergency lighting luminaires where a standard T8 lamp would not fit.
    Wattage
    8 W
    Base
    G5
    Luminous flux
    460 lm
    Light colour
    840 – neutral white (4000 K)

    Operating Principle

    Inside the lamp, an electric arc between two electrodes excites a mixture of argon and mercury vapour, which emits ultraviolet radiation. This radiation is converted into visible light by the triphosphor coating on the inner wall of the tube – such a coating gives better colour rendering (Ra 80–89) than a standard single-phosphor coating. The lamp requires a ballast to limit current; per specification it operates on a rapid-start circuit and will not run without a starter (i.e. it cannot be connected directly to the mains on its own).

    During ignition, the electrodes are preheated so that the arc strikes quickly and without prolonged flickering – important in emergency luminaires, where the lamp must switch on instantly when power transfers to battery supply. Under low power (emergency mode) the lamp continues to shine steadily, only at a reduced luminous flux, since the electrodes and phosphor coating are designed for this variable operating regime.

    What makes the Tungsram TUN T5 8W 840 useful?
    It suits both everyday and emergency lighting in a single luminaire – the designer does not need to choose a separate model for each mode. The G5 base and 288.3 mm length match standard T5 8 W sockets, so the lamp is a direct replacement for a worn-out lamp of the same type, with no luminaire modification needed.

    Technical Specifications

    Model Tungsram TUN T5 8W 840 Specfill™
    Product type T5 fluorescent lamp, triphosphor
    Wattage 8 W
    Base G5
    Luminous flux 460 lm
    Luminous efficacy 57.5 lm/W
    Light colour 840 – neutral white (4000 K)
    Colour rendering index (CRI) 80–89 (Ra 8x)
    Beam angle 360°
    Length 288.3 mm
    Internal reflector None
    Ignition type Rapid start
    Operation without starter No
    Suitable for emergency lighting Yes
    Energy efficiency class A
    Energy consumption 8 kWh / 1000 h

    Key Features

    • Triphosphor coating – higher colour rendering and more natural light quality than standard single-phosphor lamps.
    • Rapid start – the lamp switches on without prolonged flickering, important in emergency luminaires.
    • Reliable operation at low power – shines steadily even in emergency (reserve) power mode.
    • Suitable for emergency lighting – designed for evacuation and reserve systems.
    • Neutral white light (4000 K) – suited to work environments, homes and commercial premises.
    • Compact 288.3 mm body – fits narrow luminaire designs where a longer lamp would not fit.

    Where Is It Used?

    • Emergency lighting luminaires and evacuation systems.
    • Illumination of "EXIT" signs and directional signage.
    • Under-cabinet kitchen luminaires.
    • Lighting for aquariums and shop display cases.
    • Lighting for kitchens, home offices, garages and workshops.
    • Modular and compact luminaire designs.
    • Premises where reliable, stable lighting is important.
    • Industrial lighting systems integrated into emergency power circuits.

    Usage by Need

    For home users.
    If a T5 8 W luminaire is used in the kitchen, garage or workshop, this lamp is a direct replacement for a worn-out lamp of the same type, giving a neutral, natural 4000 K light for work areas.
    For businesses and industry.
    In facilities where emergency lighting systems are mandatory, the lamp is fitted into modular and industrial luminaires that run on both mains and reserve power – reducing the number of lamp types held in stock.
    For electricians / engineers.
    Before installation, check that the luminaire's G5 socket and ballast are matched to an 8 W lamp with a rapid-start circuit – the lamp will not run directly on the mains without a starter. In emergency lighting luminaires, confirm the lamp is compatible with the specific emergency unit used.

    Practical Application

    An emergency lighting luminaire fitted with a Tungsram TUN T5 8W 840 lamp is installed in an office corridor: running on mains power, the lamp delivers a 460 lm luminous flux, consuming about 8 kWh per 1000 hours of operation. If mains power is interrupted, the luminaire automatically switches to its battery reserve, and the same lamp continues to shine at reduced power, providing evacuation route lighting until mains power is restored.

    Pros

    • High light quality – triphosphor coating and neutral 4000 K colour.
    • Emergency lighting compatibility – confirmed suitable for use in emergency systems.
    • Rapid start – switches on without prolonged flickering.
    • Reliable operation at low power – stable light in reserve power mode.
    • Compact dimensions – 288.3 mm length fits narrow luminaire designs.
    • Energy efficiency class A – economical consumption, 8 kWh / 1000 h.

    Cons / Limitations

    • Shorter service life than LED alternatives.
    • Not suitable for use in extremely low temperatures.
    • Requires a suitable ballast / luminaire – will not work connected directly to the mains without a ballast.
    • Operation without a starter is not supported – the luminaire's electronic circuit must match the rapid-start type.
    • Colour rendering index of 80–89 – moderate, not suited to top-tier (Ra 90+) applications.

    Safety and Installation Notes

    • Always disconnect the luminaire's power supply before replacing the lamp.
    • Install only into a G5-type socket matched to an 8 W lamp.
    • Use only with a ballast and rapid-start circuit designed for the lamp – an incorrect ballast shortens the lamp's service life or damages it.
    • In emergency lighting luminaires, verify the lamp's compatibility with the specific emergency unit before installation.
    • When fitting the lamp into the glass housing, do not push or pull on the conductors – hold it by the base.
    • Dispose of a worn-out lamp in accordance with WEEE (waste electrical and electronic equipment) regulations; do not dispose of it with household waste.

    Quick Selection Guide

    Wattage
    8 W
    Base
    G5
    Luminous flux
    460 lm
    Light colour
    840 – neutral white (4000 K)
    Suitable when you need:
    • a T5 8 W G5 lamp with neutral 4000 K light and higher colour rendering;
    • a lamp suitable for both everyday and emergency lighting;
    • a compact 288.3 mm solution for narrow luminaires.
    Check before use:
    • whether the luminaire's base is G5 and its rating matches 8 W;
    • whether the ballast / emergency unit is suited to a rapid-start lamp;
    • whether the lamp will be required to run without a starter directly from the mains;
    • whether the required colour (840, 4000 K) meets the project requirements.
    Important reminder:
    The lamp is compatible only with a matching ballast or emergency unit – incorrect connection can shorten its service life or prevent it from switching on.

    FAQ

    Does the lamp work without a starter, connected directly to the mains?
    No. The lamp requires a ballast with a rapid-start circuit.
    Is it suitable for emergency lighting?
    Yes – the lamp operates reliably even in low-power emergency (reserve) power mode.
    What is the lamp's colour?
    840 – neutral white, 4000 K.
    What is the lamp's length?
    288.3 mm.
    Can it be used in a cold environment?
    No, the lamp is not suitable for extremely low temperatures.
    What is the luminous efficacy?
    About 57.5 lm/W (460 lm luminous flux at 8 W power).

    Fluorescent Lamp T5 | G5

    Tungsram TUN T5 8W 840 – an 8 W T5-type fluorescent lamp with a G5 base, triphosphor coating and 460 lm luminous flux in a neutral 4000 K colour. Suited to both everyday lighting and emergency lighting luminaires where reliable operation at low power is required. Its compact 288.3 mm length allows use in narrow luminaire designs.

    Illustrative image may have been created using AI. The appearance of the product may differ slightly from the image shown. Please refer to the technical specification.

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