The aim of this study was to measure the effect of different irradiation times by Light Emitting Diode (LED) on Water sorption and solubility of two different glass ionomer restoratives. Materials and methods: Two conventional GIC materials Equia Forte (EF) and Fuji IX (FIX) were used in this study. The specimens were divided into 3 experimental groups (n = 10) In Group 1, which is the control group of the study, where the specimens after mixing were left in the mold to set without any irradiation. In Group 2; the specimens were irradiated for 40 seconds at the top surface using a LED light curing unit using standard curing mode, after 2 minutes of termination of mixing. In Group 3; the specimens were irradiated for 40 seconds at the top surface using a LED light curing unit using standard curing mode after 4 minutes of termination of mixing. All specimens were subjected to a pH cycling model. Specimens were tested for water sorption and solubility % at baseline and after pH cycling. Results: water sorption results in EF were statistically higher than Fuji IX, irrelative to pH modeling. However, the results differ in case of irradiation time, the control group >after 2 min> 4 min. while solubility % irrelative to material effect, was higher in pH modeling than baseline, yet 4 min> control group >after 2 minutes irradiation time. Conclusions: Water sorption is material dependent while solubility is pH dependent. Irradiation by LED could be safe option to improve both.