Table 2.

Light dose parameters (7).

Irradiation parameter	Measurement unit	Description
Energy	Joules (J)	Energy (J) is calculated as: power (W) × time (s).
Energy density	Joules/cm2	Most laser dosages are given in this unit but this could be unreliable as it assumes a reciprocity relationship between time and irradiance.
Irradiation time	Seconds	This is the time to deliver the appropriate energy density.
Treatment interval	Hours, day, or weeks	Different time intervals may result in different outcomes.