The letter T is used in front of the number to show the fluorescent bulb is a tube type. Following the letter is a number representing the diameter of the bulb measured in fractions of an inch. Fluorescent bulb widths are measured in eighths of an inch. For example, a T5 bulb is five-eighths of an inch wide, a T8 bulb is 1 inch wide (eight-eighths) and a T12 is 1-1/2 inches (12/8ths) in diameter.

Color is measured in a temperature reading known as Kelvin. Higher Kelvin temperatures produce cooler whiter shades while lower kelvin temperatures produce a more yellow shade.

Warm3000 k
  • Produces an inviting, relaxing light
  • For use in any room
  • Perfect for kitchens and bathrooms
Neutral3500 k
  • Produces a pleasant light
  • For use in any room
  • Perfect for offices
Cool White4100 k
  • Produces a bright, clean light
  • For use in garages, basements and work environments
Natural Light5000 k
  • Simulates natural lights
  • For use in any room
Daylights6500 k
  • Produces a white light
  • Ideal for those who prefer the cool blu-white illumination of daylight