Check the listing for details. T8 Emergency LED Tube Light 18W 4ft 5000K ETL listed. Color: White, Condition: New. Listed at 106.00 USD. E2 Lighting emergency double-ended T8 plastic bulb comes with an integrated emergency battery back-up that can be used as a regular T8 bulb and an emergency bulb. It has a test button and indicator lamps so that it is safe with fire protection standards. It has over-charging and over-discharging protection which ensure the lifetime of the batteries (800 times charging and discharging). This emergency T8 bulb is a cost-effective option for various emergency lighting applications such as office buildings, schools, hotels, apartment buildings, corridors and stairs. Can be used with the emergency feature when the other bulbs in the fixture are T8 LED bypass bulbs. The battery is 3 years warranty and the tube is 5 years warranty. This tube will need to be double-ended wired - hot to one end and neutral to the other end. Can be used with shunted or unshunted sockets. Unshunted socket example is Leviton # L13351-U · 2-in-1 bulb - Regular T8 lighting and emergency lighting · Built-in lithium batteries · Test button and battery check indicator · Must operate on a separate circuit · Emergency time - 90 minutes · Uses 3 watts and has 384 lumen output when used with the battery · Double-ended: Can be used with shunted or unshunted sockets · When using a 2+ lamp fixture one bulb can be wired to emergency constant power for emergency use or the entire fixture can be if neededE2 Lighting emergency double-ended T8 plastic bulb comes with an integrated emergency battery back-up that can be used as a regular T8 bulb and an emergency bulb. It has a test button and indicator lamps so that it is safe with fire protection standards. It has over-charging and over-discharging protection which ensure the lifetime of the batteries (800 times charging and discharging). This emergency T8 bulb is a cost-effective option for various emergency lighting applications such as office buildings, schools, hotels, apartment buildings, corridors and stairs. Can be used with the emergency feature when the other bulbs in the fixture are T8 LED bypass bulbs. The battery is 3 years warranty and the tube is 5 years warranty. This tube will need to be double-ended wired - hot to one end and neutral to the other end. Can be used with shunted or unshunted sockets. Unshunted socket example is Leviton # L13351-U · 2-in-1 bulb - Regular T8 lighting and emergency lighting · Built-in lithium batteries · Test button and battery check indicator · Must operate on a separate circuit · Emergency time - 90 minutes · Uses 3 watts and has 384 lumen output when used with the battery · Double-ended: Can be used with shunted or unshunted sockets · When using a 2+ lamp fixture one bulb can be wired to emergency constant power for emergency use or the entire fixture can be if needed