The effects of three physical parameters of the UV-A LED illuminator
prototype, number of LED diodes, voltage and distance from sample, on
ΔE of the surface of Golden Delicious apple slices were assessed at room
temperature at different exposure times (10, 20, 30, 40, 50 and 60 min).
As reported in Table 1, the effect of experimental treatment on ΔE data
was significant (P ≤ 0.05) after 30 min of irradiation.