GE T5 HO 24 W 24" 6500K

24 watt= 2,000 Lumens each
39 watt= 3,300 Lumens each
54 watt= 5,000 Lumens each

Use only these High Output (HO) lamps in HO T5 fixtures.  Lamps that are not marked HO will have significantly less output.