Why would he do that? He has already spent more money than a good light would have cost.
It's like buying anything. You not only need to know what to buy, but where to buy. We are lucky to have a Grow Generations here. I don't even remember seeing a blurple light in their store. Don't know how big the store is but it's "WalMart" size. If there is a big supplier of any kind that's the place to start. They almost always have everything a commercial grower needs, and at the same price.