We're sorry to be the bearer of bad news, but Grow Blu went out of business very suddenly back in 2015.
You may still be able to find second-hand Grow Blu lights somewhere, but if you're looking for a good alternative, we recommend Black Dog LED. They had a recent price drop and are now similar in price, but much higher quality (plus you get a warranty). They are also manufactured in the US, while Grow Blu made their lights in China.
Sorry for the inconvenience and we hope you find an alternative you are happy with.
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