The base of the lamp has two slider buttons. One toggle adjusts the warmth, from cold white light all the way to red. One adjusts the intensity, from ultra-bright down to a glareless glow. Hard taps on each button skip ahead, while holding the toggle down on one side or another adjusts the light settings quite slowly—slowly enough I at first sometimes question whether it's happening.

The maximum brightness is 1,000 lumens—the approximate intensity of a 75-watt incandescent bulb. At this brightness, the battery lasts about five hours. At a lower intensity, this can extend to as long as a dozen hours.

Red Shift

There's an added feature I have come to appreciate at night, which is the red-light mode. There's little evidence that blue light from your little smartphone is keeping you awake at night. But numerous studies do show that blue light wavelengths can affect melatonin levels and thus your body's circadian rhythm, while red light doesn't do this.

Red light therapy is, of course, the province of TikTok as much as science—a field where wild exaggerations live alongside legitimate uses and benefits. For every sleep study showing that red light is superior to blue light when it comes to melatonin levels, there's another showing that red light is associated with “negative emotions” before bed.

So I can only offer my own experience, which is that Edge Light Go's red reading light offers me a pleasant liminal space between awake time and sleepy time, one not offered by a basic nightstand lamp. It allows me to sort of bask in a darkroom space that still lets me see and read, and drift off a little easier.

If I fall asleep, the light has an automatic 25-minute shut-off, which means I won't do what I far too often do, which is drift off while reading and then wake up, alarmed, to a room filled with bright light in the middle of the night.

Caveats and Quirks

This said, for all the virtues of portability, the Edge Light Go does not boast a base that's heavy enough to stop the lamp from tipping over if I bend it forward from its lowest hinge. This can be an annoyance when trying to use the lamp as a reading light from a bedside table or the arm of a couch.