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Eric Phillips are very good for warranty, I tweeted them when an LED I bought went back to flashing constantly after 2-3 years. They got in touch and sent me a replacement, all the way from Netherland. The new one was a better model too!
And I think the problem with LEDs is often the cri. Low cri and high colour temperature can look very bright, but doesn't really light things up well. Remember the old sodium street lights, they were very efficient but you couldn't read a colour underground map or anything!
Better quality LEDs have less lumens per watt but the light they do produce is better for seeing things.
Not sure what that is about pulsed light seeming brighter, LEDs should be dimmed by pwm as they don't dim linearly well, but that won't make them seem brighter than the average time they're on. If the frequency is too low you'd see the brighter light flashing though. Your eyes are non linear too, they adjust for light levels down to a certain point.
And I think the problem with LEDs is often the cri. Low cri and high colour temperature can look very bright, but doesn't really light things up well. Remember the old sodium street lights, they were very efficient but you couldn't read a colour underground map or anything!
Better quality LEDs have less lumens per watt but the light they do produce is better for seeing things.
Not sure what that is about pulsed light seeming brighter, LEDs should be dimmed by pwm as they don't dim linearly well, but that won't make them seem brighter than the average time they're on. If the frequency is too low you'd see the brighter light flashing though. Your eyes are non linear too, they adjust for light levels down to a certain point.