Ofc can't comment on durability and can't measure efficiency but I'm very impressed with the price. Nice color, only slightly yellowish (ordered warm, like it, spent most of my life indoors under yellow Inca lamps, preferences may vary). I have experience with Phillips & GE bulk budget lightbulbs, basically what I have filled my house with. I ordered a dozen of these baddies and selectively picked where I want to increase productivity by 2x. I can say that I'm familiar with the ceiling bounce test and I'm pretty sure these 1600L drivers are actually twice what I'm used to from 700-800 drivers of well-known brands. They're heavy I think, for good reason, they don't seem to get any hotter than the semi-light ones. Highly recommended, I am very happy with these lamps. and I am NOT always satisfied with plain Amazon branded stuff. Bretti good
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