<table>
<tr>
<th valign="top">
							Issue
					</th>
<td width="10"></td>
<td>
<div>
											E3S Web Conf.
									</div>
<div><strong>Volume </strong>694, 2026				</div>
				
					                Third International Conference on Green Energy, Environmental Engineering and Sustainable Technologies 2025 (ICGEST 2025)
	            					</td>
<tr><td colspan="3"></td></tr>
<tr><td class="sep_issue" colspan="3"></td></tr>
</tr>
<tr>
<th>
					Article Number
					</th>
<td></td>
<td>03005</td>
</tr>
<tr>
<th>
					Number of page(s)
					</th>
<td></td>
<td>11</td>
</tr>
<tr>
<th>Section</th>
<td></td>
<td>Green Energy Systems &amp; Technology</td>
</tr>
<tr>
<th>DOI</th>
<td></td>
<td>
<a href="https://doi.org/10.1051/e3sconf/202669403005">
					https://doi.org/10.1051/e3sconf/202669403005
				</a>
</td>
</tr>
<tr>
<th>Published online</th>
<td></td>
<td>
				16 February 2026
			</td>
</tr>
</table>

## Analyzing solar panel power based on light intensity at different wavelengths

Mohammed Hasan Ali*

Department of Electrical Power and Machines Engineering, University of Diyala, Iraq

* Corresponding author: This email address is being protected from spambots. You need JavaScript enabled to view it.

Abstract

The performance parameters of a photovoltaic (PV) solar system are investigated in this study at different light wavelength, irradiance levels and temperature conditions. The electrical performance of a monocrystalline silicon solar panel, employed as the main energy conversion element, was investigated under laboratory controlled light. The characteristics are open circuit voltage (Voc), short circuit current (Isc), maximum power output, and efficiency. Spectrum fluctuations were simulated using red, blue and yellow high brightness LEDs. The irradiance was measured with a calibrated solar power meter and it was set by neutral density filters. By observing the panel surface using a thermocouple sensor and changing surrounding conditions, temperature effects were examined. Experimental results show that the PV output was strongly depending on both irradiance and spectral wavelength, shorter wavelength (blue light) contributed a higher voltage but longer wavelength (red light) generated a higer current but worse efficiency. Furthermore, the negative temperature coefficient of silicon cells meant that when the panel was heated, a significant decrease in voltage and overall performance occurred. The investigations provide valuable information in designing solar energy systems over different climatic conditions and demonstrates the influence of spectral- as well as temperature-induced effects relevant to the performance of PV.

© The Authors, published by EDP Sciences, 2026

This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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