A couple more thoughts.
Firstly, I know of spotlight packs that you can purchase with either a 55w
globe, or a variable 5 to 100w globe.
Second, an old farmer, now deceased, recommended that when driving country
roads at night you use your low beam lights, not high beam. He said that high
beam dazzles the wildlife and by the time they hear your vehicle and come to
their senses, they run the only place they can see - which is that nice space
right in front of your vehicle all lit up brightly by you. Low beam, on the
other hand, alerts them to your presence without dazzling them so they can move
out of the way into the bush without having lost their night vision. (I suspect
it also makes you drive slower ;)
Chris.
________________________________
From: Dave Torr <>
To: David Adams <>
Cc: Birding Aus <>
Sent: Wednesday, 23 September, 2009 8:18:39 AM
Subject: Re: [Birding-Aus] Spotlighting
Many lights are rated in candlepower -
http://www.onlineconversion.com/faq_10.htm shows you can't convert watts to
candlepower. It all depends on efficiency - watts is how much electricity is
used, candlepower (and the other measures of light intensity) show how much
light you get. An efficient 30 watt system will be much brighter than an
inefficient one, so it looks like the paper is not very useful?
2009/9/23 David Adams <>
> On Tue, Sep 22, 2009 at 8:40 PM, Kingfisher Park Birdwatchers Lodge
> <> wrote:
> > Hi Folks,
> > To add further to the spotlighting debate the following links have some
> > interesting information regarding research.
> >
> > www.jcu.edu.au/rainforest/infosheets/possum_*spotlight*.pdf
>
> In case anyone else has any trouble with the download, I had to take
> the * out of the link to make the link work.
>
> I've read this info sheet before and thought it made a good point: a
> brighter light makes animals turn away before you can see them or
> makes them leave more quickly. Conclusion: use a less intense light
> and you'll see more.
>
> The question I've had from this paper is how bright is right? The
> author talks about "under 30 watts" - I spent some time shopping for
> torches and none of them indicate their brightness in terms of watts -
> or in a unit convertible to watts. Can anyone suggest what "less than
> 30 watts" means in terms that are commonly used with
> spotlights/torches?
>
> Thanks very much.
> ===============================
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> birding-aus.blogspot.com
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