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I had exactly this (or thought I did) recently, so pinged an email off to them saying that only 2 LEDs were lighting up etc. Their response told me that the other 2 only light after a short while riding and they go off instantly on stopping, so it can give the impression that only 2 are lit. Their recommendation was to rotate the mount so you can see the face of the light whilst riding and go for a short ride in daylight.
I haven't done it yet but bits of their email might be relevant to you if you are only gauging whether the second 2 LEDs are working based on the standlight function or spinning the wheel by hand, which is not enough.
They also sent me a warranty/service form so I get the impression that they will be good about fixing it if there really is a problem, but I need to do the test first...
spj7-
Yep, got the same email. I'd done enough night riding before going away to know the top LEDs dim quickly and had tested that while riding to confirm the vertical LEDs weren't illuminating. I initially assumed the dynamo wasn't putting out enough then put off doing anything about the situation as I didn't want to unlace a freshly tubelessed wheel.
Posting the light back to Exposure tomorrow and hopefully find out what's up with it shortly.
atk
Tried with/without the redeye. I've used it extensively in the past and expected the light to take a while to warm up. I'm guessing either the LEDs have had it, or something's come loose/failed inside the lamp.
@grams that makes sense. I'll probably pop an email off to Exposure rather than dig out the power supply. They've fixed several lights for me in the past and rather not risk any further damage and a more expensive repair :)