It is practically negligible and unmeasurable. But let us give an explanation of what SAR is and where the measurement of this quantity is of relevance. SAR (specific
absorption rate) refers to electromagnetic radiation in the radio frequency (RF) range (3KHz – 300 GHz) which includes mobile telephony, radio waves, microwave radiation, magnetic resonance imaging, etc. All these electromagnetic radiations incite healing effects which is best experienced when a cell phone is used for extended periods of time. Besides frequency, the power of the radiation, in units of Watts, has the most important role. The unit of SAR represents the absorbed energy per unit of body weight averaged over a specified area and is given in Watts/kg or W/kg. The upper limit in European Union for appliances is 2 W/kg. For reference purposes, the SAR value of the iPhone 12 is 0.99 W/kg, while most of the mobile phones of the latest generation have SAR values in the range of 0.9 – 1 W/kg. The red light diode used in Lucha T8 device emits light of frequency equal to approximately 320 GHz while the power is approximately 10 mW (1 W = 1000mW). Once 10 mW is averaged over the weight of the person and the application area the SAR value of Lucha T8 is practically negligible.