A: Hi Brian,
The LED O-rings are a suggested or recommended item - they aren't required for operation.
The LED bulbs are a little narrower at the base than glass bulbs and for folks who are looking at longer term installations or really inclement weather the o-rings just provide an additional moisture barrier.
If you do decide to purchase the o-rings, be sure to really snug them down to insure a good connection at the base of the socket.
Hope that helps,
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Answer provided by: Shellie Gardner (10/4/2013)