Case airflow indicators :)

I wonder,
http://www.ebay.co.uk/itm/2-x-8-Wind-Turbine-Powered-Car-LED-Exterior-Light-White-/250688911705?pt=AU_Car_Parts_Accessories&hash=item3a5e393959
Can we get a couple of these to show airflow in a case?
brighter the light, more air is getting to them :P
Moto
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