Nisa Khan is a scientist studying the effects of LED lighting and is concerned about its negative impact on well-being.
Nisa Khan is a scientist with a strong focus on lighting and, specifically, LED lighting and its dangers.
LED stands for Light Emitting Diode. It's a type of light source that uses a semiconductor to emit light when an electric current passes through it.
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LEDs are super efficient, last ages and don't get hot like old-school bulbs.
LED lights disrupt sleep—blue light suppresses melatonin, leaving you tossing and turning all night.
— Alexander Wunsch, physician and photobiology researcher
However, as Nisa argues, the convenience comes at a cost.
Her discussion with me is quite scientific and requires concentration but the gist is that LED lighting is harmful because it is not only artificial but also two-dimensional, unlike the three-dimensional light from the sun, a candle or even an incandescent bulb (which uses heat).
In other words, sunshine and candles are the healthiest because they're natural, followed by incandescent bulbs.
Blue light from LEDs at night spikes alertness—your body thinks it’s noon, wrecking your circadian clock.
— Janet Sparrow, professor of ophthalmic sciences
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