The PWM strobe effect is significantly more noticeable in the M30 than any other flashlight in my collection. Here are a few beamshots of an overhead ceiling fan, spinning at its lowest setting. Note: The strobe effect is only noticeable in the low and medium modes, not the high mode. (Click on thumbnails to enlarge.)
.... ....
M30 (low) .......................M30 (medium) ................M30 (high) ................. Note: Subtle (imperceptible by naked eye) PWM on
1/30 sec, F3.5, ISO 100
.....1/30 sec, F3.5, ISO 100
.....1/30 sec,
F8.0, ISO 100
. high, when compared with other flashlight photos.
....
L2D CE (high) ..................L2D CE (turbo)
1/30 sec, F3.5, ISO 100
.....1/30 sec, F3.5, ISO 100
....
P3D Rebel 100 (high) .......P3D Rebel 100 (turbo)
1/30 sec, F3.5, ISO 100
.....1/30 sec, F3.5, ISO 100
.... ....
ED-P72 (low) ..................ED-P72 (medium) ............ED-P72 (high)
1/30 sec, F3.5, ISO 100
.....1/30 sec,
F8.0 ISO 100
.......1/30 sec,
F8.0, ISO 100
I'm not particularly sensitive to PWM issues, but I have to say that the strobe effect on low and medium is quite pronounced. I would guess that the darker the ambient lighting conditions, the longer one uses the light, and the more intensive the visual task; the more irritating the problem would be. I can understand how Monkeyboy found the beam very disconcerting on his hike in the woods. It probably would have driven me bonkers.
(Well, that's what backup lights are for, right? :tinfoil
I tried using the diffuser, in the hopes that the more diffuse beam would limit the staccato effect. However, the diffuser did nothing to mollify the strobing. :sigh:
EDIT:
Correction. I forgot about one light that I have with a similar PWM issue - my L0D CE. On low, the strobe rate looks about the same as the M30's. On medium, the LOD's PWM frequency is higher (better), slightly less noticeable, but still present. Not a problem on high.
The L0D's PWM doesn't bother me for a few reasons: (a) It's generally used for very short periods of time, 30 seconds to 2 minutes. (b) It's generally used for very close-in tasks, under 5 feet, with nothing moving very quickly. (c) I generally don't pan a scene in low or medium. If I pan a scene, I have the L0D on high. (d) The situations where I most use the light is being plunged into darkness after being in the light, i.e., my eyes are not night-adapted. They are therefore less sensitive to beam peculiarities.