These T5HO 2700K fluorescent light bulbs simulate late day light, great for flower formation. Utilizing cold chamber technology, these grow light bulbs are long lasting and provide 10,000 hours of peak illumination. Available in three sizes 2', 3', and 4'. Stock up and save!

Note: SunBlaster replacement tubes are designed for SunBlaster fixtures only and are not designed for other light fixtures, as they run shorter than standard bulbs.