4 foot linear T5

F54T5/5000HF/HO/BP-LL
Item: 4 foot T5 bulb
Specs per ANSI C78.1-1991
54 Watts, program start ballast recommended
Color Temperature: 5000 degrees Kelvin

4 foot linear T8

F32T8/5000HF/BP
Item: 4 foot T8 bulb with Medium bi-pin (G13) bases and filament
Specs per ANSI C78.1-1991
32 to 55 Watts capable (depending upon ballast)

Warm White T8

F32T8/2700K/BP-LL
Here is an extremely long life warm white (2700K) bulb with good color rendering
Item: 4 foot T8 bulb with Medium bi-pin (G13) bases and filament