It's funny that I said it CAN be a burn, not saying specifically that anyone or everyone here had a burn. You and others who are disagreeing, are making definitive blanket statements, without actual data.
Except, of course, the parts where … we give you actual data. See above for “ionizing radiation."
Again, if someone has a reaction to the light used in the sensors
Nobody has. We know this because physics. Visible light is not ionizing radiation. Infrared light is emphatically not ionizing. The watch only uses visible and infrared light in its sensors.
By the way, my wife gets burns from UV light
Ultraviolet light is ionizing radiation. The amount of exposure required to burn an individual varies greatly across the population, but there is some threshold amount of UV exposure that will cause a burn in any individual.
Non-ionizing radiation? Even direct sunlight (with UV filtered out, of course) is too dim to cause a burn; you have to significantly concentrate it, such as with a magnifying glass. The sensors are nowhere near as bright as the sun.
Look, it’s fine that you don’t understand basic physics. Everybody encounters these concepts for a first time.
And it’d even be okay for it to be too low a priority for you to spend time to get up to speed. All our lives are busy.
What’s not cool is to insist that your ignorance trumps everybody else’s knowledge.
For what it’s worth, “The sensors in my Watch burned me” is scientifically on a par with “The Earth is flat” and “That woman a witch and she turned me into a newt” and “Things only move when something else pushes on them.” Once upon a time, those ideas were incontrovertible, but that time was centuries ago. They were incontrovertible because they made sense so long as you didn’t know better and didn’t push hard enough to see if they actually made sense — which is why they still persist at the fringes today.
Today they’re fringe because it’s trivial to know better and to push hard enough to see that they actually don’t make sense.
Your homework: Get a UV-cut filter from your local camera shop. Also get a good-sized magnifying glass, a shot glass full of water, and a thermometer. Put the thermometer in the glass outside on a sunny day and wait for the temperature to stabilize. Focus the magnifying glass on the water, but not on the thermometer. Note how the temperature of the water changes. Repeat the experiment with the UV-cut filter between the Sun and the magnifying glass. Repeat the experiment again in a darkened room with an Watch’s sensors as the light source. Analyze and report your findings.
Extra credit: use the temperature data to calculate the increase in heat energy. Hint: you’ll need to know the volume of the water.
Bonus extra credit: calculate the rate of change of energy and create a model describing the relevant equilibrium states.
Cheers,
b&