I have got a lot of Photon 3 lights (bulk purchase ...).
Usually, I keep them in half power mode (at least for the "dangling" ones, on keyrings or attached to my beltpack).
Most of the time, it's enough light.
And the momentary switch gives a full light any time, if needed in a hurry.
I use the autoshut-off feature if there is a risk of unwanted pressure on the switch (lights stored in confined space, ie PSK).
Last week, I had to go under a sink to look for a leak in the plumbing : a Photon 3, in medium constant mode, hold between the teeth, was very helpfull !
As for the blinking modes, I guess they are more usefull for signaling or to attract attention (a red Photon3 used in replacement for a dead rear light on a bike, at night ...)
I did get a high percentage of failing lights, but as someone said, the Customer Service is great : Bryan AVERY has been very helpfull, either to solve the shipping problems I had with the first shippment or, later, to replace the DOA lights.
Alain
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Alain