Double-ended T3 J-type linear halogen in the 118 mm length, from 100W to 300W, delivering up to 4,505 lumens on an R7S base.
As with the shorter size, length decides fitment absolutely — this lamp will not fit a 78 mm fixture and vice versa, so the measurement leads the title. Wattage within the length then determines output, which runs high enough here to cover a work site.
This is the high-output end of the linear range and sells into trade and site use. The shorter size is 78 mm linear, and the LED equivalent is in LED specialty.