Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number THS4005A-16TB found under Lamp Sodium by Lithonia. The National Stock Number assigned to this part is 6240013322701, and the Federal Supply Class is 6240 Electric Lamps. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like THS4005A-16TB.