This publication contains a dataset of 3024 simulations of irradiances and diffuse attenuation coefficients obtained and calculated with Hydolight software in CSV (.csv) and Python 3.8.0 DataFrame (.pkl) format. Each simulation has its condition of solar zenith angle, cloud coverage and water type (represented by the concentration of chlorophyll, mineral and CDOM absorption), at PAR band (400-700 nm wavelength) and several depths. On the one hand, this data shows the downwelling irradiances obtained by Hydrolight. On the other hand, it shows the annular irradiances and the downwelling and annular diffuse attenuation coefficients calculated from this data. Data contains the following variables: Ed (Wm-2) calculated_Ed (Wm-2) calculated_Ea_10 (Wm-2) calculated_Ea_20 (Wm-2) calculated_Ea_30 (Wm-2) calculated_Ea_40 (Wm-2) calculated_Ea_50 (Wm-2) calculated_Ea_60 (Wm-2) calculated_Ea_70 (Wm-2) calculated_Ea_80 (Wm-2) calculated_Kd (m-1) calculated_Ka_10 (m-1) calculated_Ka_20 (m-1) calculated_Ka_30 (m-1) calculated_Ka_40 (m-1) calculated_Ka_50 (m-1) calculated_Ka_60 (m-1) calculated_Ka_70 (m-1) calculated_Ka_80 (m-1) Data contains the following index: wavelength: "PAR" band (400-700 nm) depth: 0.2, 0.5, 1.0, 1.5, 5.0 and 10.0 m. SZA (solar zenith angle): 0, 10, 20, 30, 40, 50, 60, 70 and 80 degrees cloud: 0, 20, 40, 60, 80 and 100 % num: from 0 to 3023 water_type: ultra clear, very clear, clear, moderate, turbid, very turbid and brown chl: from 0 to 67.6 mg m-3 cdom: from 0 to 22.5 absoption 380 m-1 mineral: from 0 to 38.7 g m-3