Linestra tubes are unique to the fixtures that hold them. They are available in two wattages and lengths. Try T10 tubes to replace T12 fluorescents - they are SUPER BRIGHT
 

T12 "U" Bend fluorescents have been an industry standard for years. Upgrade to 6500K and bring some sunshine into your environment!
 

T12 fluorescents have been an industry standard for years. Upgrade to 6500K and bring some sunshine into your environment!
 

T2 fluorescents are newer technology. They are a unique technology; please verify they fit in your undercabinet lights.
 

T4 fluorescents are newer technology. They are a unique technology; please verify they fit in your undercabinet lights.
 

T5 fluorescents are the newest technology on the marketplace. They provide significantly more lumens per watt than any other "T" tube. They only fit in fixtures with the proper sockets and ballasts. Because of their superior light output, they are worth the upgrade. Upgrade to 6500K and bring some sunshine into your environment!
 

T6 fluorescents are newer technology. They are a unique technology; please verify they fit in your fixtures.
 

T8 "U" bend fluorescents are a better fluorescent choice than T12's. They provide many more lumens at a lower initial wattage. These bulbs may be able to fit into your existing T12 fixtures and function. However, it will shorten the life of the bulb and your fixture ballast. Upgrade to 6500K and bring some sunshine into your environment!
 

T8 fluorescents are a better fluorescent choice than T12's. They provide many more lumens at a lower initial wattage. These bulbs may be able to fit into your existing T12 fixtures and function. However, it will shorten the life of the bulb and your fixture ballast. Upgrade to 6500K and bring some sunshine into your environment!