Sankyo Denki - Germicidal UV lamps
Made in Japan
Ultraviolet rays:  253.7nm (nanometers) 

Germicidal lamps efficiently emit a large amount of ultraviolet rays 253.7nm (nanometers) which have excellent germicidal effect. These lamps have structures and electrical characteristics similar to those of general fluorescent lamps used for illumination but use ultraviolet ray glass which efficiently transmits ultraviolet rays at 253.7nm. 
This wavelength is in the region of maximum germicidal effectiveness and is highly lethal to virus, 
bacteria, protozoa and mold.

The lamps are primarily useful for sterilization of air, the surfaces of various materials and water or liquid in laboratories, food processing industries and for disinfecting water supplies.

 Type  Lamp Wattage   Length (mm) Diameter
Cap (B) Average Useful Life (Hr)
 G8T5  8  287  15.5  G5 6,000
 G10T8  10  330  25.5  G13 6,000
 G15T8  15  436  25.5  G13 8,000
 G20T10  20  588.5  32.5  G13 8,000
 G30T8  30  893  25.5  G13 8,000
 G40T10  40  1,198  32.5  G13 8,000

Philips TUV PL-S 5W/2P 1CT

Overall Length C: 105 mm
Diameter D: 28 mm

Philips TUV PL-S 9W/2P 1CT
Overall Length C: 167 mm
Diameter D: 28 mm

Philips TUV PL-S 11W/2P 1CT
Overall Length C: 236 mm
Diameter D: 28 mm