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How to measure your hole size

Picking the right size takes 30 seconds. You only need a tape measure.

Step 1: Measure the hole in your ceiling

Measure straight across the cut-out hole, edge to edge, at its widest point. Measure the hole itself, not the light you are replacing. The face of a downlight is always a little bigger than the hole, because it covers the edge.

If your ceiling has no hole yet, decide the size first and cut to match.

Step 2: Match it to a size

Hole across Choose
About 2 inch (5.1 cm) 2 inch COB downlight, or an adjustable panel light
About 3 inch (7.6 cm) 3 inch downlight, or an adjustable panel light
About 4 inch (10.2 cm) 4 inch downlight, or an adjustable panel light
About 5 inch (12.7 cm) 5 inch downlight, or a 2 to 6 inch adjustable panel light
About 6 inch (15.2 cm) 2 to 6 inch or 2 to 8 inch adjustable panel light
About 8 inch (20.3 cm) 2 to 8 inch adjustable panel light

Every Deltalite product page lists the hole size it fits. You can also filter the ceiling lights collection by hole size.

Hole between two sizes, or not perfectly round? Choose a frameless adjustable panel light. These fit a range of hole sizes, such as 2 to 6 inch or 2 to 8 inch, so you do not need an exact match.

Step 3: Check a few more things

  • Measure at two or three points. Cut holes are often slightly uneven.
  • Leave space above the ceiling for the light and its driver.
  • Replacing old lights? Measure one hole and check the rest are the same.

Shop by hole size

2 inch 3 inch 4 inch 5 inch 6 inch 8 inch

Still not sure?Send us a photo of your ceiling or your room size and we will help you pick.
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