From: black.hole.4.spam{at}gmail.com (Don Hills)

In article
,
"John Beamish"  wrote:
>
>I don't have a lux meter (plase bring yours when you, Gill and the kids
>finally visit!) so I don't know if they have a warm up issue or not.  I'd
>not be surprised if they do -- but the change, if it occurs, is slow
>enough that it isn't perceptible to me.

If you have a photographer's exposure meter, or a camera with a built-in
meter, you can estimate the light intensity change. One f-stop = half (or
double) the light intensity. It can be hard to notice because the light
spectrum doesn't change appreciably, just the brightness and your eyes
compensate for it.

>Look at item "F" at the bottom of the page.
>http://www.orientationsnova.com/boutique/index.php?language=en

Holy snake oil, Batman. Pay no more than US$10 to US$15 per bulb in the 23
watt size for name brand "full spectrum" bulbs. You'll get a CRI
of about 90 instead of the aboce site's claimed 95, but it's the usual
80/20 rule: pay 20% of the cost for 80% of the performance. CFLs used for
area lighting are simply not bright enough to give any significant
therapeutic effect. You need it to literally be "as bright as
day" to be effective. You'd only want a CRI higher than 85, matched by
a colour temperature of about 6400K, if you were doing highly critical
colour matching work.

Here's a useful Wikipedia page:
http://en.wikipedia.org/wiki/Compact_fluorescent_lamp

Google will find you more than you ever wanted to know, too.

--
Don Hills    (dmhills at attglobaldotnet)     Wellington, New Zealand
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