algotithm for lighting control system using DAQ in labview

[NIquist]

Then you'll love this one: A radiometer.  Takes me back to my childhood when my Grandpa bought me one at the Hayden Planetarium.  It helped to spark my fascination with science. 

I suppose the OP could glue a hall-effect sensor on the bulb to detect the rotation speed of the vanes and calculate light intensity...  Or not.

[Hornless.Rhino]

Depending on the light source a pyrometer might be able to be used too (if there is a large enough temperature change when the lights go on).

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On a more serious note, the sensor depends on the application. What's your actual application?

[smercurio_fc]

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Hornless.Rhino wrote:

On a more serious note, ...

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And we will be happy to be serious, as soon as a serious question is asked. "which sensor is used for sensing light..." is not a serious question. It's a lazy question, asked by someone who is unwilling to spend 5 minutes to do a basic web search to educate themselves.

[Hornless.Rhino]

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@smercurio_fc wrote:

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"which sensor is used for sensing light..." is not a serious question.

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Well I did suggest a pyrometer for a reason.

Just thought it might be an idea to help them see there's not an easy answer for everything.