65 Watt—21" 6,700K Compact Fluorescent—Straight Pin Base 6,700K lamps provide a full-spectrum light that replicates sunlight to provide the essential light requirements for a successful aquarium.
Bulb Replacement Guide...
55W White (6700K) Compact Fluorescent Bulb—Straight Pin
NOTE: Current USA/Panasonic Compact Bulbs and Hamilton Compact Fluorecent Bulbs are not interchangeable.
Realux Bulbs and Hamilton Bulbs are interchangeable.