The goal is to choose a panel size that stays securely in place, while still allowing enough clearance for installation and future removal.
Method 1: If your current lens fits well, using those same dimensions is a workable plan.
Method 2: Getting your own measurement
- Measure the Visible Light Opening
- Measure the Maximum Inside Fixture Dimensions
- The difference between these two is the “ledge” the panel rests on
- Choose the largest size between those two that fits comfortably
Summary
A typical fit provides about 3/8″ to 1/2″ of support around the perimeter, although some fixtures allow as little as 1/4″.
If the inside of the fixture is much larger than the visible opening, a larger panel may be needed to reduce excess movement.
We see far more issues with panels ordered too large than too small. If the panel has a little movement but cannot fall out, you’re in good shape. If it’s too large, installation becomes difficult or impossible.
Need help? Contact us with your measurements and we’ll help you choose the best fit.
