Lighting & Display

26mm-Diameter Linear Fluorescent Lamps T8 fluorescent tube light

The T8 is among the most efficient fluorescent source. T8 lamps are available with three different types of phosphor coatings:

Coating with halophosphate phosphors: The halophosphates have been used for many years, but have the disadvantage that good colour rendering can only be achieved at the expense of reduced efficacy. Colour rendering ranges from 50 to 75.
Coating with three-band phosphors (or triphosphors): these phosphors achieve both good colour rendering and high efficacy; however they are more expensive than the older halophosphates. Colour rendering ranges from 80 to 85.
Coating with multiband phosphors: very high colour rendering, but this has only been achieved with some reduction in efficacy compared with the triphosphor lamps. Colour rendering of 90 and above.
During the life of a fluorescent lamp, the phosphors age and the light output decreases. The two latter coatings age more slowly than the halophosphates; these lamps therefore have improved lumen maintenance.
Application: The t8 phosphor lamps are most suitable for lighting in galleries, museums, art shops, etc. and other applications where very high colour rendering is required.
Electrical, Lighting & Security, Lamps (Bulbs) & Accessories, Fluorescent Tubes, Triphosphor Coated