MaxLume T5 24W 2' HO Tube -Grow, case of 20The MaxLume High Output (HO) T5 bulbs take into consideration the proper Kelvin temperature for growing plants. Research has proven that the 5400K temperature improves vegetative growth more than the standard 6500K lamps. Their incomparable 2800K temperature makes a noticeable difference in the bloom stage and outperforms the industry's standard T5s.