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Why do some LED bulbs show clear utility frequency flicker, while others don't? Is it there, but not visible for the weaker lamps because of less amplitude? Is the diffuse bulb coating fluorescent and smooths the flicker away?
Here a comparison of some IKEA LEDARE models, slowed down by factor 40:
Two different 200lm bulbs models (NO FLICKER):
http://www.ikea.com/gb/en/catalog/products/10255289/
http://www.ikea.com/gb/en/catalog/products/90255290/
Same type of lamp as above, but with three 400lm bulbs of this type (CLEAR FLICKER):
http://www.ikea.com/gb/en/catalog/products/80248993/
One 1000lm bulb (CLEAR FLICKER):
http://www.ikea.com/gb/en/catalog/products/20249226/
Here a comparison of some IKEA LEDARE models, slowed down by factor 40:
Two different 200lm bulbs models (NO FLICKER):
http://www.ikea.com/gb/en/catalog/products/10255289/
http://www.ikea.com/gb/en/catalog/products/90255290/
Same type of lamp as above, but with three 400lm bulbs of this type (CLEAR FLICKER):
http://www.ikea.com/gb/en/catalog/products/80248993/
One 1000lm bulb (CLEAR FLICKER):
http://www.ikea.com/gb/en/catalog/products/20249226/
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