Instruct: Classify the given review into positive or negative sentiment.
Query: I returned it but they wouldn't refund my money!

The one I got did NOT have ANY brightness adjustment control, although note the description: "adjusts brightness to the equivalent of ordinary 75, 100, or 150 W bulbs."The light was blindingly bright and because it uses a proprietary pin socket, you cannot replace the bulb with an ordinary lightbulb, and Verilux does not make a lower "wattage" bulb for this lamp.I was told by the vendor Independent Living Technologies (Garner, NC) that an older model did have an adjustable switch but that the current model does not. They would not refund my money even after I returned it to them.I note one reviewer says the light is too dim; perhaps they were sent the older model in which the adjustment control does not work properly.Caveat emptor/buyer beware. Only buy this item if you can get a money back guarantee. It cost me $35 to ship it back.