The
LH0030 HH 1-1805 is unshunted tombstone socket and fits G13 medium bipin lamp bases. It has a rating of 660w - 600v and is made of polycarbonate.The
LH0030 HH 1-805 does not have a stop (locator pin) and has a 31mm lamp axis to accomodate T10 and T12 linear fluorescents as well as T8's.
Link to T8,T10,T12,lamps that fit this socket