Yellow Skylight Diffuser Replacement

Most residential skylights use round ceiling diffusers, which is why mostly the round diffuser range is shown below. 

Find Your Replacement Skylight Diffuser

| Why your skylight has turned yellow

Most skylights installed in Australian homes use a plastic ceiling diffuser.
Over time this plastic can turn yellow, brittle or cloudy due to UV exposure and age.

If your skylight has started to look yellow, replacing the diffuser is usually a simple and inexpensive fix that restores natural light back into the room.

Skybrite supplies replacement skylight diffusers in the most common Australian sizes.

Signs Your Skylight Diffuser Needs Replacing

You may need to replace your skylight diffuser if you notice:

• Yellow or discoloured plastic
• Cloudy or dull skylight light
• Cracked diffuser cover
• Brittle plastic around the edge
• Uneven light coming through the skylight

This usually happens after 10–20 years of UV exposure.

Fortunately the diffuser can normally be replaced without replacing the entire skylight.

In some cases it is actually the ceiling surround that has yellowed, not the diffuser.
This can easily be mistaken for a diffuser problem.

If the yellow plastic is part of the ceiling frame, you may need to replace the surround instead.

View the skylight ceiling surround replacements here.

What Is a Skylight Diffuser?

The skylight diffuser is the plastic ceiling cover that spreads the incoming daylight evenly into the room.

It is sometimes called:

  • Skylight cover

  • Skylight ceiling lens

  • Skylight diffuser panel

  • Skylight plastic cover

When this plastic ages it can turn yellow or opaque, reducing the amount of light entering the room.

Replacing the diffuser restores the skylight back to its original brightness.

How To Measure Your Skylight Diffuser

Most skylight diffusers are measured by the diameter of the diffuser. Or if it smashed measuring the inside of the ceiling opening.

Common Australian sizes include:

  • 260mm diffuser

  • 300mm diffuser

  • 350mm diffuser

  • 400mm diffuser

  • 455mm diffuser

  • 500mm diffuser

To measure your skylight diffuser:

1. Remove the ceiling diffuser cover

2. Measure the inside diameter of the opening

3. Match the measurement to the closest diffuser size

Most Common Replacement Skylight Diffuser Sizes

455mm Replacement Skylight Diffuser
260mm Replacement Skylight Diffuser
300mm Replacement Skylight Diffuser
350mm Replacement Skylight Diffuser
373mm Replacement Skylight Diffuser
400mm Replacement Skylight Diffuser
500mm Replacement Skylight Diffuser
5×5 SQ Replacement Skylight Diffuser
6×6 SQ Replacement Skylight Diffuser

Do You Need Help Finding the Right Skylight Diffuser?

If you’re unsure which skylight diffuser size you need, Skybrite can help.

Send us via our contact form:

• A photo of your skylight
• The diameter measurement
• Your ceiling surround style

Our team can help identify the correct replacement diffuser.