Light Modulation and Biophoton Emissions: A Proof-of-Principle Study of Direct and Proximal Cellular Effects

Ultraweak photon emissions (UPEs) are a consistent feature of cellular metabolism, yet their potential role in mediating communication between cells remains poorly defined. This study examined whether temporally patterned light can produce biological effects not only in directly exposed malignant cells but also in neighboring, unexposed populations. B16-BL6 and MCF-7 cell lines were exposed to blue LED stimulation structured by a physiologically relevant temporal pattern, and photon emissions were quantified using a photomultiplier tube. Both cell lines showed increased viability and elevated photon emission centered near 21 Hz following direct exposure (p < 0.05). Importantly, B16-BL6 cultures that were never directly exposed but later housed in proximity to the stimulated cells displayed similar changes in both viability and emission frequency. These findings provide proof-of-principle evidence that patterned light can alter biophoton emissions and viability not only in directly stimulated cancer cells but also in proximal, unexposed populations, supporting the possibility of photonic propagation effects under controlled conditions.