Scientific studies indicate that: Yellow light (around 585 nm), red light (630-660 nm), and near-infrared light (830-940 nm) can reduce hyperpigmentation by inhibiting melanin synthesis, potentially fading dark spots. The evidence leans toward these colours being effective, as they target the processes that produce excess melanin. Yellow light is not that well researched, in contrast to red and infrared which have been extensively researched for decades. Orange light, while not as well-studied, may share effects with red and yellow due to its wavelength proximity…