SunBlaster T5 4' Replacement Bulbs. These T5HO 6400K fluorescent light bulbs provide high output, full spectrum light for your plants. Utilizing cold chamber technology, these bulbs are long lasting and provide 10,000 hours of peak illumination. Available in three sizes: 18", 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.