Although we don't believe in timing the market or panicking over market movements, we do like to keep an eye on big changes -- just in case they're material to our investing thesis.

What: Shares of Veeco Instruments (Nasdaq: VECO) closed down more than 11% after analysts expressed concerns over pricing and overcapacity in the LED marketplace. Industry peer Cree (Nasdaq: CREE) also fell more than 10%.

So what: Five analysts expressed concerns about LED demand. Canaccord Genuity downgraded Veeco to "sell" from "hold" while Deutsche Bank cut its estimates, Forbes reports.

Now what: Of the five, only one firm -- Sterne Agee -- said it continues to recommend clients buy shares. Too harsh? I think so. On a forward-looking basis, the stock trades for less than half the long-term profit growth rate analysts expect. Where do you stand? Would you buy shares of Veeco Instruments at current prices? Please weigh in using the comments box below.

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Fool contributor Tim Beyers is a member of the Motley Fool Rule Breakers stock-picking team. He didn't own shares in any of the companies mentioned at the time of publication. Check out Tim's portfolio holdings and Foolish writings, or connect with him on Google+ or Twitter, where he goes by @milehighfool. You can also get his insights delivered directly to your RSS reader.

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