GuentherWuchterl: Created page with " =Q by TdG= 1) first of all : can you provide me a (new ?) userid /password for your site ? I cannot access more with "Guest"/"IYA2009". ;-( I just checked with Gues..."

2016-04-28T13:20:42Z

Created page with " =Q by TdG= 1) first of all : can you provide me a (new ?) userid /password for your site ? I cannot access more with "Guest"/"IYA2009". ;-( I just checked with Gues..."

New page

=Q by TdG=

1) first of all : can you provide me a (new ?) userid /password for your site ?
I cannot access more with "Guest"/"IYA2009". ;-(

I just checked with Guest it works. Maybe it was in use and Mediawiki
does not handle double usage. Alternatively Gast and the same PW. But
send me your favourite userID and I will setup your login with the
same PW.

2) I'm starting with your lightmeter a large study program in Belgium (mobile version)
At this time, I'm gathering information.
But I will need to validate my calculation versus the most "suited" formulas set to gain :
- lux
- mag/arcsec²

I thought a lot about how to express the results. I decided to recommend Watt per
square-meter. Then the measurements are an exact extension of what meteorology
measures as "total radiation" or "global radiation" during the day and into the
twilight.

I also discussed this with Jan Hollan following his "What is light poll." (link
on the wiki, and he is OK with that.

With the lightmeter we can directly calibrate to Sun and Moon, thus the astro-
-stellar-reference is not necessary any more. The entire mag-system comes from problems
to calibrate to other standards then Vega, we should not keep it outside astro-apps.

Lux is problematic for many reasons, in particular with respect to the melatonin
and LED-revolution issues. mag/arcsec² is an astronomical procedure, direction
dependent more an emission measure and has no SI recognition and I see many problems as
we approach legislation.

Maybe we can discuss this on the phone +43 1 92 52 166 or next week in Tautenburg
+49 36427 863 55 . Are you using skype or similar?

Which software version (on your site, when I will re-gain access ;-) is the most "accurate" today ?
(with "capture" file saving, not only display)

I prefer the linux-version because its OpenSource and you can modify it. The
simple software for XP/NT/2000 provided by the manufacturer runs very robust
and has a built-in reboot on error and continues after reboot
if put into the AutoStart folder. The reboot feature was not necessary up to now
for the Mark2.3.

For production use the simple software

http://kuffner-sternwarte.at/hms/wiki/index.php5?title=Lightmeter-Driver#Windows_XP.2FNT.2F2000

with the download

http://kuffner-sternwarte.at/hms/wiki/uploads/Lightmeter.zip

What serial number is your instrument? Could you put informations into
the Lightmeter-list on the wiki?

What's the most suited set of formulas to use to compute this value from count, daylight, nir Marl2.3 captured values ?

There are standard procedures on the wiki. Below the full-moon you can use a factor, e.g.
5E-7 to Lux (for a factor 2 proxy, the exact value needs calibration) for the main sensor
and there is a manufacturer-recommended formula for the day- channels (both on wiki).

I wrote a text and instruction for the calibration from Sun to Sirius-values but
it requires some effort. The fastest way is to send me data from a view days
and nights and I will do the calibration to the Sun and twilight.

The daylight vis and nir sensors are only to help with a fast and rough calibration
towards Lux to get an idea for correcting the non-linear daylight part. It is not
high accuracy also for similar reasons than the SQM (and it actually uses a similar
sensor, that has a non-lambertian characteristic and no hemispheric view).

The Mark 2.3 sensor are selected for their sensitivity so you can get a quick start
by taking one of the existing calibrations for Mark 2.3. E.g for the Yonago or
Lindenberg stations.
Some calibrations are already on the GVO-Lightmeter-database (linked on the wiki)
and on the site pages. Note that Berlin, Linz, Vienna, KSO, Tautenburg etc are Mark 2.2. The
Lightmeter-List on the wiki gives you types and links to existin

10:42, 14. Apr. 2010 GuentherWuchterl

WH --[[User:GuentherWuchterl|GW]] ([[User talk:GuentherWuchterl|talk]]) 15:20, 28 April 2016 (CEST)

Lightmeter FAQ - Revision history

GuentherWuchterl: Created page with " =Q by TdG= 1) first of all : can you provide me a (new ?) userid /password for your site ? I cannot access more with "Guest"/"IYA2009". ;-( I just checked with Gues..."