UV Wavelength: 253.7nm; Irradiation intensity: >2,500uw / cm2; PORTABLE & VERSATILE. A study published Monday in the Proceedings of the National Academy of Sciences reveals that … Reviews. However, we may, from time to time and at our discretion, have special offers or promotions that would allow you to collect eCTM on that portion of a transaction in respect of which you redeemed eCTM.