FREE SHIPPING  on all orders, minimums may apply

Decks Direct

Skip to Main Content »

You're currently on:

Aurora Base Adapter

How to Use Aurora Base Adapters

Every so often you may have a unique size post – one that runs a little larger or smaller, due to the specific design or manufacture of material. That’s why Aurora Deck Lighting provides base adapters for virtually all of its post caps and post cap lights.

What is a post base adapter? Base Adapters allow you to convert existing Post Caps and Lights to fit various post sizes available. Field assembly is required to remove the existing light base or post cap top. Four phillips screws will need to be removed and reinstalled. Estimate 1-2 minutes per base. (See Assembly instructions and pdf below.)

How do Aurora post caps and base adapters work? To fit a standard size post cap or post cap light onto a unique size post, you simply switch out the original base on the Aurora post cap for an Aurora base adapter. The base adapter should be slightly larger than the post size.

Determining the post cap size needed: Always measure the actual post that you’re working with. Most standard 4 x 4 deck posts actually measure 3-1/2” x 3-1/2”. As a result, any post caps or post cap lights installed on standard wood deck posts should have a base opening of 3-5/8”. The newer composites add a level of complexity as some 4 x 4 composite posts range from 3-1/2” to 4-1/2”.

Determining if a base adapter is needed: Once a post size is determined, look on to see if the desired light or post cap is available in the size needed. If the light or post cap size you need is listed on the product page, only that product needs to be ordered. If the post cap is not available in the size needed, a post cap adapter may be added to the post cap to convert a post cap to a different size.

Choosing a base adapter size: The base adapter you choose should be slightly larger than your post by 1/8” to 1/4”. This allows the cap to slide over the post during installation, and for the post material to expand and contract with temperature changes.

Choosing a post cap size: Once a base adapter size is determined, use the information below to choose a post cap size:
• Base adapter sizes 3", 3-5/8", 4-1/16", 4-3/8", 4-5/8" or 5-1/16" = choose 3-5/8” size post cap
• Base adapter size 6-1⁄16” = choose 5-9⁄16” size post cap

View and order the Aurora Post Cap and Post Light Base Adapter now.


Download a pdf of these installation instructions (736 KB)

Be sure to order your Aurora post cap and base adapter at the same time—the post cap will arrive with its original base still attached. All you need to do is remove the original base via the four screws that hold it in place, and reattach the new base adapter. Then, install the post cap with its base adapter on your deck post, according to manufacturer instructions.

Step 1. Light with base adapter

Step 2. Remove base

Step 3. Remove electrical socket plate

Step 4. All pieces separated

Step 5. New base with plate

Step 6. Place the new base on the light

Step 7. Secure new base to the post cap

Step 8. Light and old base
  • The DecksDirect Difference

  • Real People, Real Service
  • Satisfaction Guarantee
  • Huge Selection, Fast Delivery
  • Free Shipping
  • Why Choose Us ►
  • Builder Program

  • Resources