Lampholder T12/T8 - Shunted

This is a shunted lampholder for T12 F71(6') lamps.  This is also the same lampholder used on the T8 (face) lamps of Radiance Trio models.  Use this lampholder with RT ballasts ONLY.  Do NOT use this lampholder in conjunction with open style ballast# 520001...use 530010 lampholder instead.