Why Are 2D Lamps So Confusing?

If you've ever searched for a replacement 2D lamp, you've probably seen terms like GR8, GR10q and 2GX13.

Although these lamps can look similar, they are designed for different fittings and are not interchangeable.

Choosing the correct base type is essential to ensure your light fitting operates safely and performs as intended.

What Is a 2D Lamp?

A 2D lamp is a compact fluorescent lamp (CFL) named after its distinctive flat, square shape.

These lamps have been widely used in:

• Homes
• Offices
• Commercial buildings
• Emergency lighting
• Healthcare facilities

Their design provides even light distribution while fitting into compact light fittings.

GR8 (2-Pin)

The GR8 base has 2 pins and is commonly used with fittings that have an integrated starter.

Typical wattages include:

• 16W
• 28W
• 38W

Always confirm the wattage and fitting before replacing your lamp.

GR10q (4-Pin)

The GR10q base has 4 pins and is used with electronic ballasts.

Common wattages include:

• 16W
• 28W
• 38W

Although the lamp shape is similar to GR8, the base is completely different.

2GX13 Circline Lamps

Unlike traditional 2D lamps, 2GX13 is a circular (circline) fluorescent lamp.

These lamps are commonly found in:

• Ceiling lights
• Commercial lighting
• Residential fittings

The circular shape and four-pin centre connector make them easy to identify.

If you're unsure whether your lamp is G10Q or 2GX13, read our guide:

👉 G10Q vs 2GX13: How to Tell Which Circline Bulb Base You Need

How to Identify Your Lamp

Before ordering, check:

✓ Base type

✓ Wattage

✓ Colour temperature

✓ Manufacturer code

✓ Lamp dimensions

Matching all specifications helps ensure compatibility.

Need Help?

Send us:

• A photo of your existing lamp
• The model number
• Any markings printed on the lamp

We'll help identify the correct replacement.

Shop 2D & Circline Lamps

Explore our range:

👉 https://nzlights.co.nz/collections/2d

👉 https://nzlights.co.nz/collections/circline

Related Guides

• How to Identify and Replace a Bulb by Base Type
• G10Q vs 2GX13: How to Tell Which Circline Bulb Base You Need
• Watts vs Lumens vs Colour Temperature

About NZ Lights

NZ Lights is a New Zealand-owned specialist lighting supplier with over 5 years of experience supplying replacement lamps for healthcare, dental, commercial, industrial and specialist applications.

From medical examination lights and dental equipment to specialist halogen, fluorescent and LED lamps, we help customers identify difficult-to-find replacements using model numbers, lamp specifications and equipment requirements.

Whether you're replacing a single bulb or sourcing lamps for a hospital, clinic, business or facility, our team is here to help you find the correct solution.

Need help identifying your lamp? Contact NZ Lights or send us a photo of your existing lamp, and we'll help you find the correct replacement.