The specialty group covers the formats that do not fit a standard shape: R7S J-type linear at 78 mm and 118 mm, TriLight three-way A19, emergency battery-backup lamps with a portable socket, full-spectrum grow lamps, garage and closet fixtures, and other application-driven types.
Each of these is bought for a named job rather than for a socket, so the application is stated first and the electrical specification second. That is deliberate — a buyer arriving here is solving a problem, not matching a planogram.
Specialty carries better margin than the volume shapes and reorders on failure. Cross-shop with LED A19 where a standard lamp will do, and with LED tubes for linear replacement.