GPH436T5L/HO 4pins High Energy 48W
The UVC GPH436T5L/HO is 48W. but the GPH436T5L is 21W. They are the same length (436mm).Why the high output lamp has the high energy? becuase change the diameter of the filament and add more gas in the GPH436T5L/HO lamp. According the formula Power=Current * Voltage, the same Voltage but change the current for the lamp. The power will be high. So use the high output lamp save the space for the equipment in the end.