A: These pre-wired sets have permanently installed bulbs. They have 2 LEDs per bulb.
The lens covers are faceted with a small diamond pattern.
They are not diamond faceted like this set of lights which are known as "diamond cut".
These sets have 25 LEDs spaced 8 inches apart for lit length of 16 feet. (24*8)/12 (There is a 4 inch header and footer wire on each set.)
So, for 400 lit feet, you'll need 25 sets. Consider purchasing one extra set to account for any kind of swag in the lines.
Here is a link to our all in one clips that are tailored for use with pre-wired sets.
Thanks for your question. Hope that helps.
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Answer provided by: Shellie Gardner (10/29/2013)