In the experimental setup, 11W PL
lamp [28] was used as a light source. The choice of this
kind of lamp depends on the fact that the light it gives off
resembles sunlight and the radiated heat amount is fairly low;
thus it almost does not increase the cell temperature. This PL
lamp was placed in the focus of a parabolic reflector which
was located at the bottom of an opaque case. The stainless
steel reflector was curved so as to reflect the light from the
light source to the solar module in parallel (Figure 2). The
opal glass used for diffusing the parallel reflected light was
mounted on top of the case, just beneath the cover, whereas
the solar module was placed on the inner cover.The areas to
bemeasured were located on the glass so as that they would
be in between this glass and the solar module when the cover
was closed (Figure 3).