Light from the Sun and light from a bulb have identical physical properties.
Light from the Sun and light from standard artificial bulbs possess different physical properties, notably in their spectral compositions and color temperatures.
The claim states that sunlight and bulb light have identical physical properties. Physically, the sun emits a continuous blackbody spectrum spanning a very broad range of wavelengths, whereas typical artificial bulbs (incandescent, LED, fluorescent) emit distinct, often limited or spiked emission spectra that vary widely in spectral composition and color rendering. The provided papers discuss altering and measuring spectral compositions in artificial lighting devices, confirming that artificial and natural light sources differ in their physical properties.
Sergei B. Turanov, Alexey N. Yakovlev, Aleksandr S. Malakhov. Lighting Device with Variable Spectral Composition for Growing "Chlorella" in Artificial Conditions. 2016. https://doi.org/10.4028/www.scientific.net/kem.712.277
Paper 1 discusses lighting devices with variable spectral compositions for growing organisms, implying artificial light sources can be tuned to differ from natural sunlight.
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Rosati Adolfo, Proctor Kyle, Dazaea Azad, Graham Maggie, Ates Serkan, Haley Kirschten, Higgins Chad. Agroforestry vs. Agrivoltaic: spectral composition of transmitted radiation and implications for understory crops. 2023. https://doi.org/10.21203/rs.3.rs-2911844/v1
Paper 2 demonstrates that the spectral composition of natural radiation differs significantly from that of various artificial shading and filtering structures, highlighting physical differences in light properties.
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