Recent Posts

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SQM-LU / creating a task in windows 10
« Last post by galaxy45 on January 25, 2024, 11:47:08 am »

I'm interested in "creating a task" using task scheduler in windows 10 to "open" and "start" the SQM-LU reader  everyday at 6:30pm

thank you
SQM-LU / Re: New Android app for SQM-LU
« Last post by on December 21, 2022, 03:33:09 pm »
Hi there and thanks for making this app - I hope to download it and use it in the new year.

Connected meters (SQM-LE/LU/LR/DL) / Re: SQM-LU Detection Cutoff Angle
« Last post by MgcJim on November 03, 2022, 01:25:14 am »
Excellent.  That's exactly what I was looking for.
Connected meters (SQM-LE/LU/LR/DL) / Re: SQM-LU Detection Cutoff Angle
« Last post by admin on November 02, 2022, 12:56:19 am »
The following plot shows the response of the meters at various angles.

Connected meters (SQM-LE/LU/LR/DL) / SQM-LU Detection Cutoff Angle
« Last post by MgcJim on November 01, 2022, 09:34:19 pm »
With the SQM pointed vertically, is there an effective zenith angle cutoff for measurements?  I suspect it does not measure light at a zenith angle of 90 deg.  Perhaps there is a "detection drop off" function?  My concern is the location I want to mount the meter in is not taller than the observatory that is closeby.

Weatherproofing / Customer made weatherproof housing
« Last post by admin on April 18, 2022, 11:45:57 am »
One of our customers made his own weatherproof housing for his personal observatory to hold the SQM-LU using the cap from our weatherproof housing.

The advantage here is that the cover is protected with another removable cover since he is only taking measurements when using the telescope.

Here are some photos:

Connected meters (SQM-LE/LU/LR/DL) / Important update to SQM Reader Pro 3
« Last post by knightware on March 18, 2021, 01:11:51 pm »
Knightware is pleased to announce the release of a significant update to SQM Reader Pro 3. The update is available at no charge to licensed users of SQM Reader Pro 3.

An important feature was added in this update: support for sending readings to the Globe at Night Sky Brightness Monitoring Network (GaN-MN). Users need to register their SQM installations with the GaN-MN for data to be accepted.

The update also includes enhanced support for high resolution monitors. This will be most effective on Windows 8.1 and 10 but also works on Windows 7 and 8.0.

You can learn about SQM Reader Pro 3 software at
You can learn about GaN-MN at
You can register your SQM installation by contacting
or for users in China.

Phyllis Lang
Author, SQM Reader Pro
SQM-LU / New Android app for SQM-LU
« Last post by mdborland on March 11, 2021, 06:27:11 pm »
I didn't have any luck with the SQMDroid application and besides I was not happy about having to sideload an application onto my phone, since that  bypasses Google malware scanning. So, I brushed off my Java coding skills and wrote my own app. It's available on the Google store for a nominal fee.

This app allows reading and logging sky quality data from the Unihedron(TM) SQM-LU using an Android phone. You need a USB OTG cable to allow plugging the SQM-LU into your phone.

The app not only reads the sky quality and device temperature, but also optionally the GPS coordinates if location permission is granted. If file permissions are granted, it will log the data to a CSV file. The app also uses the sensors on your phone to compute the altitude and azimuth; if you hold the SQM back-to-back with your phone, this should tell you where the SQM is pointing.

I was going to give away, but my wife hates it when I do that. In any case, for $0.99, perhaps some of you are interested.

I suppose it will work with the SQM-LU-DL as well, but since I don't have one of those I couldn't check.

General Discussion / Re: Reports
« Last post by admin on September 01, 2020, 12:54:40 pm »
This report includes long-term light pollution studies using SQM meters from 2011:

Measurements of sky brightness at Bosscha Observatory, Indonesia by D. Herdiwijaya and others.
Connected meters (SQM-LE/LU/LR/DL) / Re: GPS integration
« Last post by admin on January 29, 2020, 10:09:31 pm »
Some computers reassign the communications port at power up or re-connection, so to ensure that the UDM can recognize both the SQM and the GPS, please follow these steps:
  • Disconnect the SQM and GPS from computer before powering up.
  • Power up the computer.
  • Start up UDM.
  • Connect the SQM and ensure you get a reading.
  • Disable the GPS connectivity from the log continuous tab.
  • Connect the GPS, and under the Log Continuous GPS tab ensure you are getting GPS location data.
  • Carry on from there.
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