2GX13 T5 Circline 40W 840 Cool White Fluorescent Tube – 300mm

The 2GX13 T5 Circline 40W 840 Cool White Circular Fluorescent Tube is a high-output circular replacement lamp designed for compatible fittings requiring a 40W T5 Circline fluorescent tube with a 2GX13 4-pin base.

Producing approximately 3300–3400 lumens with a clean 4000K Cool White (840) colour temperature, this lamp provides bright, broad and even illumination from its slim circular design.

With an approximate 300mm outside diameter and 16mm T5 tube diameter, this lamp is suitable for compatible low-profile ceiling fittings, commercial luminaires and specialist circular fluorescent fixtures.

This lamp is particularly useful for replacing older or increasingly difficult-to-find 40W/840 2GX13 T5 Circline fluorescent lamps, including compatible OSRAM / LEDVANCE, Philips, Sylvania and other equivalent lamps where the wattage, base, colour code and dimensions match.

Key Features

• 40W circular fluorescent lamp
• T5 Circline design
• 2GX13 4-pin base
• 840 colour code
• 4000K Cool White
• Approx. 3300–3400 lumens
• CRI approximately 80+
• Approx. 300mm outside diameter
• Approx. 16mm tube diameter
• Slim circular / ring-shaped fluorescent design
• Bright, even light distribution
• Suitable for compatible electronic control gear
• Ideal replacement for compatible 40W/840 2GX13 lamps
• Suitable for commercial, residential and professional applications

Technical Specifications

Compatible & Equivalent Lamp References

This 40W 840 2GX13 T5 Circline fluorescent lamp may be suitable as a replacement for equivalent circular lamps requiring:

40W • T5 • 2GX13 • 4-Pin • 840 • 4000K • Approx. 300mm

OSRAM / LEDVANCE Cross-Reference

A particularly useful replacement reference is:

OSRAM / LEDVANCE FC 40W/840 – 2GX13

You may also find:

LUMILUX T5 FC 40W/840

GTIN 4050300528526

The OSRAM / LEDVANCE specification matches the important lamp format:

40W • 2GX13 • 840 • 4000K • 3300 lm • 16mm tube

If your existing lamp is marked FC 40W/840, compare the physical diameter and connector configuration before ordering.

Philips & Sylvania References

Customers may also encounter:

Philips MASTER TL5 Circular 40W/840

or

Sylvania T5 Circline Plus 40W/840

These are useful identification references for the same 40W / 840 / 2GX13 Circline lamp family.

Important: Manufacturer references are provided as a replacement and identification guide. Always confirm wattage, base, pin configuration, colour temperature and physical dimensions before ordering.

Common Applications

The 2GX13 T5 40W 840 Circline fluorescent lamp is commonly used in compatible:

• Commercial ceiling fittings
• Offices
• Retail stores
• Schools
• Dental and medical environments
• Hotels and hospitality areas
• Residential ceiling fittings
• Apartment common areas
• Kitchens and utility rooms
• Public buildings
• Work areas
• Specialist circular fluorescent fixtures

The circular shape distributes light evenly around the lamp, helping create strong illumination without the length of a conventional straight fluorescent tube.

How to Identify the Correct Replacement

Before ordering, check the markings printed on your existing circular fluorescent tube.

For this product, look for:

40W + T5 + 2GX13 + 840 + 4000K

You may also find:

40W/840

FC 40W/840

MASTER TL5 Circular 40W/840

2GX13

840

4000K

or another manufacturer-specific model number.

Also measure the outside diameter.

For this product:

Outside Diameter: Approx. 300mm

Tube Diameter: Approx. 16mm

What Does 840 Mean?

The 840 colour code is an important identification number when replacing fluorescent lamps.

8 = CRI approximately 80+

40 = approximately 4000K colour temperature

Therefore:

840 = CRI 80+ / 4000K Cool White

This is particularly useful because many older fluorescent lamps have 840 printed on the tube without explicitly stating 4000K.

If your existing lamp says 40W/840, it indicates a 40W lamp with approximately 4000K Cool White light.

You should still confirm the 2GX13 base and physical dimensions before ordering.

2GX13 4-Pin – Important Compatibility Information

This product uses a 2GX13 4-pin base, with two pins positioned on each side of the connector section.

For this product, check:

✓ 40W

✓ T5 Circline

✓ 2GX13

✓ 4-Pin

✓ 840

✓ 4000K Cool White

✓ Approx. 300mm outside diameter

Do not choose a circular fluorescent replacement based only on wattage or ring shape.

840 / 4000K Cool White Light

The 840 / 4000K Cool White colour provides a clean, neutral-white light that is well suited to functional residential and commercial environments.

Common applications include:

• Offices
• Kitchens
• Retail stores
• Commercial interiors
• Dental and medical spaces
• Schools
• Work areas
• Apartment common areas
• Utility rooms
• General-purpose ceiling lighting

Compared with 830 / 3000K Warm White, 840 produces a cleaner and cooler-looking light appearance.

If you're replacing one lamp in an existing installation, check for 840 or 4000K on the old tube to maintain a similar light colour.

Hard-to-Find 40W Circline Replacement

Traditional T5 circular fluorescent lamps are becoming harder to source as many fluorescent ranges are phased out.

If your existing fixture remains operational, replacing the lamp with the correct 40W 2GX13 T5 Circline tube can allow you to continue using the existing fitting without replacing the complete luminaire.

Keep your old lamp until you have confirmed the replacement.

Need Help Finding the Correct Circline Lamp?

If you're unsure whether this 40W T5 2GX13 840 Circline lamp is the correct replacement, send NZ Lights a clear photo of your existing lamp showing the printed markings and connector/base.

If possible, also provide the outside diameter.

We can help identify the correct wattage, base, colour code, colour temperature and physical size required for your fitting.

Why Buy from NZ Lights?

NZ Lights specialises in replacement lamps and hard-to-find lighting products for residential, commercial and professional applications throughout New Zealand.

• Specialist replacement lighting range
• Hard-to-find Circline fluorescent lamps
• 2GX13 circular lamps available
• Replacement options for discontinued lamp ranges
• Multiple wattages and colour temperatures
• Single and bulk quantities available
• NZ-based product support
• Fast nationwide delivery
• Daily dispatch from Christchurch, New Zealand