Effective wavelength for disinfection

Contrary to what is conventionally believed, the wide germicidal wavelength of MP lamps (200-320nm) is much more effective against pathogens and viruses than the single monochromatic wavelength of LP lamps (254nm).

Using medium pressure for disinfection is considered better than low pressure for two main reasons:

  1. Recent studies show that due to MP lamps' wide germicidal wavelength, considerably less UV dose is required to achieve the same disinfection level as LP lamps.
  2. With LP lamps, bacteria regeneration is very common and is a source for contamination in the fish tanks. Conversely, bacteria treated with MP lamps are less likely to repair themselves.