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Re: Next step for DAP Ambient Light Events

From: Doug Turner <dougt@mozilla.com>
Date: Sun, 26 Aug 2012 20:47:56 -0700 (PDT)
To: "Tab Atkins Jr." <jackalmage@gmail.com>
Cc: Daniel Glazman <daniel.glazman@disruptive-innovations.com>, www-style@w3.org, public-device-apis@w3.org, Dzung D Tran <dzung.d.tran@intel.com>
Message-ID: <968683589.1636889.1346039276103.JavaMail.root@mozilla.com>
Do you have a link to the CSSWG's consensus on the names and ranges?


----- Original Message -----
From: "Tab Atkins Jr." <jackalmage@gmail.com>
To: "Dzung D Tran" <dzung.d.tran@intel.com>
Cc: "Doug Turner" <dougt@mozilla.com>, "Daniel Glazman" <daniel.glazman@disruptive-innovations.com>, www-style@w3.org, public-device-apis@w3.org
Sent: Friday, August 24, 2012 3:39:18 PM
Subject: Re: Next step for DAP Ambient Light Events

On Fri, Aug 24, 2012 at 3:10 PM, Tran, Dzung D <dzung.d.tran@intel.com> wrote:
> My thoughts:
> Ambient light sensors have different range in lux depending on the manufacture and type of use.  I don't know if it makes sense to map these values into "type".
> Just a couple data point from googling..:
> http://www.maxim-ic.com/datasheet/index.mvp/id/7175
> http://www.intersil.com/en/products/optoelectronics/ambient-light-and-proximity-sensors/light-to-digital-sensors/ISL29011.html

Do they return different lux values in the same light conditions? If
so, that sounds like simple manufacturing bugs that haven't been
important enough for people to care about yet.  That would actually be
a strong argument to *avoid* exact values (since they aren't "exact"
at all), and to instead just use a handful of keywords describing
lighting conditions.

Note that the multitude of types details in the link in the original
post seems excessive.  Further discussion in the CSSWG has mild
consensus on using just three values, "dim", "bright", "washed".
Exact names don't matter; the point is just that they map to the three
major lighting condition categories - a dark room or nighttime
conditions, normal interior lighting or outdoor shade, and direct

These three categories are distinct and useful.  It doesn't appear
that you really need any more detail than that in common usage.

Received on Monday, 27 August 2012 03:48:23 UTC

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