Reply To: What could go wrong? Home › Forums › Red Light Therapy › What could go wrong? › Reply To: What could go wrong? October 28, 2020 at 6:17 pm #1141 MarianneParticipant @masterpopo and @GeoLad I guess to whichever you are comfortable. They are just almost identical to each other. it’s just that IRL penetrates deeper and produces body heat that causes the person to sweat.