Excellent quality, reliable socket 
UL listed component 
Rotate lamp 90 degrees to lock in place 
All Tek-Lights, New Wave® 42, 44, 48 have program start ballasts.

New Wave&#714; 22, 24, 28 and Sun Blaze® 44, 48 have instant start ballasts.

Program Start Ballasts require non-shunted sockets

Instant Start Ballasts require shunted sockets