At 15:53 14/11/01 -0500, you wrote:

I am sorry but the light reading should have been 0.01 Lux. I am just now
trying to determine the full range and accuracy required. I will forward
this when known.

Thanks,

Peter
>You can start with the short circuit current of a solar cell.  It will
>be cheap and sensitive.  You may need a logarithmic amp before you
>digitize.  Accurate log amps are not cheap.  How accurate do you need to
>be?
>
>Sherpa Doug
>
>> -----Original Message-----
>> From: Peter Grey [mailto:martech@OZEMAIL.COM.AU]
>> Sent: Wednesday, November 14, 2001 3:36 PM
>> To: PICLIST@MITVMA.MIT.EDU
>> Subject: [EE]: Light Sensors
>>
>>
>> I wish to measure light during the night. I am told that
>> typical levels are
>> around 0.1 lux. They want a wide range with good resolution.
>> By the way it
>> must be light and cheap! Has anyone got any suggestions? I am
>> trying to
>> measure a broad band of visible light that animals are
>> exposed to. The moon
>> is also a factor.
>>
>> TIA
>>
>>
>> Peter
>>
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>
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