Review on Fluval A13926 Edge 42 LED Fixture by Dana Johnson

Bought to replace the new 6 gallon Edge tank. The original LED bulb was only 3W, but this 42-LED bulb increases the light output to 5W, which is almost 1W/gallon. Plant-wise still a weak light tank, but should help. updated: 18.05. - If you're considering upgrading your 6 gallon rim with this more powerful flashlight, here are a few tips: 1. The lighting will be too bright for some species of fish (Neon Tetras, for example, like dimmer lighting)2. The increased lumens also encourage algae growth. I reverted to the original light for the spring/summer months to better control the algae.