Expose the test item to continuous 24-hour cycles of controlled simulated solar radiation and dry-bulb temperature as indicated on Figure 505.5-1 or as identified in the requirements document, measuring and recording test item temperatures throughout the exposure period. For convenience, and if the test facility is unable to perform the continuous curve of Figure 505.5-1, to approximate the curve increase and decrease the solar radiation intensity in a minimum of eight levels (see Annex C, Figures 505.5C-5 and C-6 for the stepped levels) for each side of the cycle, provided the total energy of the cycle as well as the spectral power distribution (above 1000 w/m2 – see Table 505.5-I and Annex B, paragraph 1.4) is maintained. Perform the longer of the following number of cycles, and record the results