To summarise the results from the tests of the solar cell types under the three white-light illumination sources: the devices exhibit their highest power density under illumination from an incandescent source, with the exception of the AM-1815 which exhibits its optimum performance under fluorescent lighting. These results indicate that the wavelengths at which the different solar cells are sensitive are
most prevalent in incandescent light. This is as expected as incandescent light emission covers a wider spectral range
than CFL or LED sources which emit over narrower ranges. Further in the case of CFL the emission is in a number of bands of wavelengths, as shown previously in Fig. 2.