Do they pwm flicker on lower modes? If they used a higher frequency PWM and a slightly warmer LED, I'd be so happy
They don't flicker, in any mode, to the discernable eye.
They are not infinitely dimmable per se, which is what I think of when I think of pulse width modulation.
Instead, these ICON lights have a low mode, and a high mode, in both the short, and the long, broad lamps.
The pencil point beam only has one mode.
I have found that I use the short broad lamp in the low mode the most, typically in the L configuration, where the lamp fixture is below eye level, so that I don't catch a glimpse of the LED itself, while what I want to view is magically illuminated.
I want to keep my pupils open/dilated at night, and not have them iris down when encountering a bright light source. That is why I appreciate the power of the magnet with these ICON lights, because the magnet enables the lights to be confidently stuck on undulating non-flat ferritic vertical surfaces... like the round arch of a U type wire fence post... in such a way that I never have to see the LED itself.
Only what I am working on is illuminated.
Of course, this is the principle advantage of head worn lights also (we used to call them miner's lights, as only coal miners were known to wear them on their hard hats). Not ever having to see the light source, while having what you are looking at being magically illuminated, is one way to work effectively in the dark, with less light.
However, where the ICON lights "shine" better than headlamps is when one has to move back and forth between point A and point B.
So let's say point A is my truck with tools within it, and on the tailgate, and point B is whatever I am working on in the field. With a couple ICON lights on top of my cab shining down into the truck bed, and a couple of more ICON lights on top of the side boxes along the length of the truck bed, and a couple of more on top of whatever it is that I am working on, I can be at Point A, and look over at Point B, and see both, where my headlamp illumination might not reach Point B until I walk over closer to it.
I find this helpful as I forget where I leave things that I take back and forth between Point A and Point B, so if I don't find it near me, I can glance up and see if it is over there, without walking over there. If that makes any sense.
A headlamp powerful enough to see over there is too bright to see over here, due to the reflections against what I am looking at. Reflections are another "source" of light that will iris down my pupils in order to manage it. Smaller pupils reduce peripheral vision acuity of the surroundings at night, making me more apt to trip over stuff.
Hence, having multiple sources of light improves situational awareness.
Running the smaller (shorter length) LED broad lamp on the lower (dimmer, but not variably so) setting mode not only conserves battery power, enabling the lamps to offer illumination for longer periods (several hours), the lower setting also reduces contrast between what is lit, what is reflected, and what is outside the swath of light, which keeps my pupils wide enough to see everything at night, like a cat.
It is the dexterity and flexibility in form factor that is so appealing about the ICON light, combined with the magnet mentioned. These features are not exclusive to the ICON brand, which was likely inspired not only by the popularity of the Braun version within Harbor Freight brands, but also likely knocks off a few features from industry name brands like Astro Pneumatic, Snap-On, Matco, Mac, etc.
The thing with Harbor Freight is... they have invested in the real estate, bricks, mortar, and trucking to bring tools that I otherwise would not be aware of to my consciousness. There is no Matco truck that makes monthly stops at my residential garage.
Since all light is a wave length of energy, scientifically speaking, perhaps all light can be captured "flickering" with the right instrumentation. But using my eyes only, the LED bulbs in the fluorescent fixture whose ballast I never upgraded in my kitchen flicker. These ICON lights don't.