This non-brand option was cheaper than other replacement bulbs for my Verilux lamp. I don't know if this is a difference between Verilux models, but this lamp did not match my Verilux floor lamp bought 5 years ago. Floor Lamp Verilux Original Natural Spectrum Deluxe, Graphite It didn't fit, that is BEFORE I took a fine-toothed hacksaw and cut off the guide ribs on either side. Then it fits. No word on durability yet, but as far as I can tell the light is the same as the original bulb (which came with the kit). By the way, the native lamp lasted 5 years. A rough estimate, I'm guessing it took 2500 hours.
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