[Electronics-talk] [EXTERNAL] adjusting camera exposure on iphone

[Steve Jacobson]

Yes and no.  The light detector that I have on my iPhone does not really differentiate between sunlight and light 
bulb light, but one can determine which one is getting to some degree by the direction from which the light is 
coming.  If one had light bulbs right over a window it might be difficult without moving closer to the window to 
see if the light you are detecting is coming from outside or inside, and it might be hard to tell if a yard light 
is on during the day.

I have a couple of other light probes that are stand-alone devices and have nothing to do with the iPhone.  One of 
them is very sensitive to quick changes in light level.  While it can't completely determine if light comes from 
the sun or a bulb, it can sense the slight variation in intensity of light from an electric bulb that uses 
household electric current.  The tone sounds rougher.  Bulbs that are powered by batteries or some low-voltage 
power sources will not exhibit this behavior, though.

Best regards,

Steve Jacobson

On Fri, 6 Feb 2015 11:45:53 -0500, Star Gazer via Electronics-talk wrote:

>Can these apps tell the difference between sunlight and light bulb light? 
>My new baby needs it dark to sleep (obviously) and we have weird switches in
>our house, up doesn't always mean that the light is on. It's weird and I
>haven't figured out the patern. I suspect that the lights are linked
>somehow. 
>The light probe sounds like it'd be useful.

>-----Original Message-----
>From: Electronics-talk [mailto:electronics-talk-bounces at nfbnet.org] On
>Behalf Of Baracco, Andrew W via Electronics-talk
>Sent: Friday, February 6, 2015 11:40 AM
>To: Philip Blackmer; Discussion of accessible electronics and appliances
>Subject: Re: [Electronics-talk] [EXTERNAL] adjusting camera exposure on
>iphone

>I seem to recall an app called light Detector. Try launching the App Store
>and searching on that phrase 

>-----Original Message-----
>From: Electronics-talk [mailto:electronics-talk-bounces at nfbnet.org] On
>Behalf Of Philip Blackmer via Electronics-talk
>Sent: Friday, February 06, 2015 1:23 AM
>To: Electronics-talk at nfbnet.org
>Subject: [EXTERNAL] [Electronics-talk] adjusting camera exposure on iphone

>I need a way to test light levels and just how bright lights are and I would
>like to use my Iphone.  Is this possible using voiceover?  If so how?  If I
>need an app can you recommend one?  If I can't do this with an iphone can
>anyone recommend anything I can try?           

> 

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