Other people have already addressed that $90 is not that much for good lighting.

But why would the price point of things have any bearing on whether we're in a bubble? If consumers are buying those things at what you would consider to be a high price, that's an indication of strength in the market for tech goods. A strong market doesn't imply a bubble. If there was a great deal of investment in expensive products which were then not being purchased, that would be bubble, but the price point itself does not stand as evidence that this is what's happening.