The sun emits a K rating closest to 6500, and these 4-foot T5 replacement bulbs bring that brightness indoors for you. Each bulb is rated at 5000 lumens and are perfect for strong vegetative growth.

Pro-tip: Many growers add a warmer bulb for flowering cycles. Grab a 3000 Kelvin 4-foot T5 replacement bulb and fill in your spectrum.

Each bulb puts out 5,000 lumens. Replacement T5 bulb for any T5 compatible light systems.