Please help me with calculation
I read in the link https://www.thorlaser.com/LLLT/calculating-LLLT-dosage.htm
A 500mW laser with a beam area of 0.25Cm2 used for 20 seconds delivers 40 J/cm² A 200mW laser with a beam area of 0.1Cm2 used for 20 seconds delivers 40 J/cm² A 30mW laser with a beam area of 0.015Cm2 used for 20 seconds also delivers 40 J/cm² Each of these probes apparently apply the same "dosage". However, the total energy delivered is clearly different [10 Joules, 4 Joules and 0.6 Joules respectively].
--------So what it is the formula for energy delivered by laser or LEd ?? many thanks