T5 4' Replacement 6400K Bulbs (Case of 4)
T5 4' Replacement 6400K Bulbs (Case of 4) at HorticultureSource.com -
T5 4 Replacement 6400K Bulbs (Case of 4) (eco-4423) For use with eco-4015 Single T5 Fixture with Tube 48 - 54W & eco-4017 4 T5 System w/reflector, strip & tube Manufacturer's Product Information MSRP $ 9.95