Can anyone suggest a strobe light ringer for a Cisco 7940 phone in a loud area?

I have a couple of Cisco 7940 VoIP phones back in our plant and am typically told that nobody can hear them ring.  Does anybody have any experience with or a suggestion on some type of strobe light that would flash when the phone rings?
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I don't know anything about a strobe light, however if you can either crack open the 7940 and add a couple of leads off the ringer or you can pull it off an FXS port using a shared number with the 7940.

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