These 18 Watt PC bulbs fit the 6 Watt nano cube as well as any power compact light for 18 W
These are our standard 18 Watt aquarium bulbs.
We are a Dealer/Reseller of the Transworld Aquatics Line of JBJ Products. For warranty information please contact us and we will fwd you to the correct place. Most of their products carry at least a 1 year warranty.