Firstly, they don't seem to match the brightness of the original 40w bulbs. As for the color, maybe it's my fault for buying the 6000K, but the color was terrible. There was also noticeable flickering on high. At low settings, the flickering was so severe it was unbearable - the movement in the light was like lightning and gave me a headache. Glad I'm not an epileptic. I can't judge effectiveness and durability because I replaced them after 24 hours.
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