I can't tell. I'd use a control picture as reference, and compare, if this were my test.
To test for visible PWM, I use a fan. After that, I use a camera with very short exposure time ;)
Streaks and dots in both pics to me 
This…
It is.
I use the manual control on my camera/phone camera to check for any “flickering”, normally between 1/1000 to 1/2000 exposure the “flickering” will show clearly. I’m awfully sensitive to mid to low frequency “flickering”, even those that claims by some as “high-enough” or not PWM in its strict sense. For me, it doesn’t matter whether it’s On-Off or “Stay-On but does square wave”, as long as it’s not constant current, it’s being put to “flickering” category for me. 
yup both have PWM but the right pic is worst 
…and what about the streaks?
It’s like there’s 2 light sources. I get that the water droplets can move at different speeds which isn’t accurately represented with a still picture. But as pointed out by TK it seems like a pretty flawed test.
oh I didnt see that 
I shine a light at my spinning usb fan to test for pwm. Works well
Is it just me, or is there a face in the water on the right side? Creepy! 
There is a face there for sure.
Looks kinda like a caricature of Stan Laurel with his little hat.
Kind of a mirror-image of
Anyhoo, when I put my face close, stare at the image, and kinda go cross-eyed, I kinda see a 3D image of a swan.
The dots in the second picture aren’t necessarily PWM, they just look like the “ripples” in a stream of water reflecting light at different angles to me.
all you have to do is wave your finger back and forth rapidly, in the beam
or point at a rotating ceiling fan
wle
There’s zero chance someone will be able to see 10kHz or faster PWM doing that.
Fast movement of light source - the best PWM test.
maybe but
a. at that frequency, isn;t it imperceptible?
b. would the shower test work for that, assuming PCM/no PCM matters at that frequency?
Ha ha. It was a trick question. She’s not even using a flashlight.
She’s screwing with us… “PWM” are the initials of the person whose face is on the right side 
Lol……Selene is playing a game for sure…
I just read her response. Sounds like both are PWM however, just at different frequencies or types….
… (this space intentionally blank, to put the answer at the top of page 2 instead of the bottom of page 1) …
Okay, the poll has been running for a day now. That provides enough results… so here’s the answer.
First, as of this comment, the poll results are:
- A. 65% (39 votes) : Left=PWM, Right=PWM
- B. 10% (6 votes) : Left=PWM, Right=Constant
- C. 17% (10 votes) : Left=Constant, Right=PWM
- D. 8% (5 votes) : Left=Constant, Right=Constant
Total votes: 60
The correct answer is B. The light on the left uses PWM (FW3A), while the light on the right delivers constant current (L3 L10). Both were running at 30 lumens.
There was enough information in the pictures to determine which was which but, just as in real life, it required looking very closely. Click for the zoomed-in picture and look at the narrowest streaks in the middle area of each image. That’s where the visual difference is most apparent.
Of the 60 people who answered, 90% picked a wrong answer:
- 82% had a false positive (thought the right image used PWM)
- 25% had a false negative (thought the left image used constant current)
- 17% got both wrong
- 10% chose the correct answer
The big, bright dotted lines are not PWM. Most of the smaller dotted lines aren’t PWM either. Those are just oscillations in the shape of the water droplets. The water vibrates, spins, or jiggles rapidly as it falls, and this changes how it reflects light. So even a constant current light looks like it has PWM unless you look really closely and are good at interpreting the data.
This is why I don’t recommend the shower test. It’s very error-prone, even among flashlight enthusiasts.