Like t5 lamps, t8 lamps are tubular. The t8 lamps are 8/8ths, or one inch, in diameter. Introduced in 1981, as an improvement over the old t12 lamps, the t8 is considered superior in color to the t12.

It is common to see outdated t12 fixtures replaced with t8. However, when compared to t5 fixtures, t8 lamps are only recommended in commercial applications less than 20 feet high because they project less glare.

T8 fixtures are also larger and bulkier than t5, making them less desirable for home usesitting rooms, shopping malls, residential room. Offices and hotels.