36" (3 foot) T12 fluorescent tube 1900 Lumen (63 LPW) 62 CRI 20,000 Hours Circuit: Preheat/Rapid Start Bulb has a slight rattle when turned end to end which is part of the design from the factory. This is normal. We are a USA based small business. Any issues with your order please contact us and we will resolve it. F30T12/CW (2 Pack) 30 Watt T12 Fluorescent Tube Light Bulb 30W F30T12 Cool White 4100k Replaces F30T12/CW/RS/ALTO F30T12/SPEC41/RS F30T12/CW/RS/UPC F30T12/SP41/RS F30T12/RS/KB/ECO