{"product_id":"unihedron-sky-quality-meter-lu-sqm-lu","title":"Unihedron Sky Quality Meter - LU (SQM-LU)","description":"\u003ch2\u003eUnihedron Sky Quality Meter - LU\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd valign=\"top\" with=\"100%\"\u003e\n\u003cp\u003e\u003cb\u003eA USB SQM model for night-time sky brightness monitoring!\u003c\/b\u003e\u003c\/p\u003e\n\u003cp\u003eAn affordable meter for continual, connected measuring of sky brightness for astronomers!\u003c\/p\u003e\n\u003cp\u003eThe \"Sky Quality Meter - LU\" measures the brightness of the night sky in magnitudes per square arcsecond.\u003c\/p\u003e\n\u003cp\u003eDesigned by Dr. Doug Welch and Anthony Tekatch\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cb\u003eUses:\u003c\/b\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eFind out how good the night or site REALLY is.\u003c\/li\u003e\n\u003cli\u003eCompare the sky brightness at different sites quantitatively.\u003c\/li\u003e\n\u003cli\u003eDocument the evolution of light pollution in your area.\u003c\/li\u003e\n\u003cli\u003eSet planetarium dome illumination to mimic the skies people are likely to experience elsewhere in the city.\u003c\/li\u003e\n\u003cli\u003eMonitor sky brightness through the night, night-to-night, and year-to-year.\u003c\/li\u003e\n\u003cli\u003eDetermine which nights show the greatest promise for finding the 'faintest fuzzies'!\u003c\/li\u003e\n\u003cli\u003eCalibrate the effect of sky brightness on qualitative measures such as the Bortle Scale.\u003c\/li\u003e\n\u003cli\u003eInvestigate how sky brightness correlates with the solar cycle and month-to-month sunspot activity.\u003c\/li\u003e\n\u003cli\u003eHelp provide local ground truth for future sky brightness prediction with the\u003cspan\u003e \u003c\/span\u003e\u003ca href=\"http:\/\/cleardarksky.com\/csk\/\"\u003eClear Sky Clock\u003c\/a\u003e.\u003c\/li\u003e\n\u003cli\u003e\n\u003ca title=\"Charge-Coupled Device (type of image sensor)\"\u003e\u003cstrong\u003eCCD\u003c\/strong\u003e\u003c\/a\u003e\u003cspan\u003e \u003c\/span\u003eusers can make a correlation between the SQM reading and when the background reaches some\u003cspan\u003e \u003c\/span\u003e\u003ca title=\"Analog-to-Digital Converter\"\u003e\u003cstrong\u003eADC\u003c\/strong\u003e\u003c\/a\u003e\u003cspan\u003e \u003c\/span\u003elevel.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cb\u003eFeatures:\u003c\/b\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eSky brightness reported in visual magnitudes per square arcsecond.\u003c\/li\u003e\n\u003cli\u003eInfrared blocking filter restricts measurement to visual bandpass.\u003c\/li\u003e\n\u003cli\u003eSensor temperature, model number, and serial number are provided.\u003c\/li\u003e\n\u003cli\u003ePrecision readings at even the darkest sites.\u003c\/li\u003e\n\u003cli\u003eField-upgradeable firmware.\u003c\/li\u003e\n\u003cli\u003eOpen protocol\u003cspan\u003e \u003c\/span\u003e\u003ca href=\"http:\/\/unihedron.com\/projects\/darksky\/cd\/SQM-LU\/SQM-LU_Users_manual.pdf\"\u003edocument\u003c\/a\u003e.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eWeatherproof Housing\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThis housing design is made to protect the SQM-LE\/LU from normal outdoor conditions including weather and insects.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eFeatures:\u003c\/b\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eWhite surfaces reflect the hot summer sunshine.\u003c\/li\u003e\n\u003cli\u003eOpening on bottom to allow moisture to escape.\u003c\/li\u003e\n\u003cli\u003eGlass top to prevent scratching when removing ice.\u003c\/li\u003e\n\u003cli\u003eRaised glass surface to prevent dirt and leaves from collecting.\u003c\/li\u003e\n\u003cli\u003eSmall glass opening to minimize internal heating due to the Sun.\u003c\/li\u003e\n\u003cli\u003eCable opening at bottom sealed with open-cell (breathable) foam prevents insects from entering.\u003c\/li\u003e\n\u003cli\u003eMarine silicone seal rated for outdoor use.\u003c\/li\u003e\n\u003cli\u003eSilicone seal around glass extends beyond glass-plastic interface to prevent ice from building in crevices.\u003c\/li\u003e\n\u003cli\u003eHose clamps for easy mounting to pole.\u003c\/li\u003e\n\u003cli\u003eStaples for easy mounting to wood surface.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eDetails:\u003c\/b\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"http:\/\/unihedron.com\/projects\/sqmhousing\/housing-all.pdf\"\u003eDiagram of all SQM meters that fit into housing (PDF)\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"http:\/\/unihedron.com\/projects\/sqmhousing\/photos\"\u003ePhotos\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"http:\/\/unihedron.com\/projects\/sqmhousing\/housing_glass_versions.pdf\"\u003eGlass versions (PDF)\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"http:\/\/unihedron.com\/projects\/sqmhousing\/wiring\"\u003eSQM-LE wiring layout inside housing.\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cb\u003eWhat you get:\u003c\/b\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eHousing with removable top cap. 8.8 x 18.7cm, 360g.\u003c\/li\u003e\n\u003cli\u003eTwo adjustable clamps.\u003c\/li\u003e\n\u003cli\u003eTwo staples for mounting to wood.\u003c\/li\u003e\n\u003cli\u003eInstruction sheet.\u003c\/li\u003e\n\u003cli\u003eAn optional PoE (\u003ca href=\"http:\/\/unihedron.com\/projects\/sqm-le\/PDFspecs\/PoE\"\u003eLinksys WAPPOE-5V or D-Link DWL-P200 or TL-POE200\u003c\/a\u003e) for extended length SQM-LE installations.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cb\u003eTechnical Specifications\u003c\/b\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eUSB connectivity\u003c\/li\u003e\n\u003cli\u003eIncluded applications for reading data in Perl.\u003c\/li\u003e\n\u003cli\u003eThe Half Width Half Maximum (HWHM) of the angular sensitivity is ~10°. The Full Width Half Maximum (FWHM) is then ~20°. The sensitivity to a point source ~19° off-axis is a factor of 10 lower than on-axis. A point source ~20° and ~40° off-axis would register 3.0 and 5.0 magnitudes fainter, respectively.\u003cspan\u003e \u003c\/span\u003e\u003ca href=\"http:\/\/unihedron.com\/projects\/sqm-l\/fovannotated.jpg\"\u003eAnnotated FOV spec\u003c\/a\u003e.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003ca href=\"http:\/\/unihedron.com\/projects\/darksky\/images\/fovcurves.jpg\"\u003eComparison chart\u003c\/a\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e.\u003c\/li\u003e\n\u003cli\u003eSize 3.6 x 2.6 x 1.1 in.\u003c\/li\u003e\n\u003cli\u003eMaximum light sampling time: 80 seconds.\u003c\/li\u003e\n\u003cli\u003eMinimum light sampling time: 1 seconds.\u003c\/li\u003e\n\u003cli\u003eSpecifications are subject to change without notice.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eIn the Box\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eUnihedron Sky Quality Meter - LU\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cb\u003eMeter only\u003c\/b\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ctable width=\"100%\" style=\"width: 100.073%;\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd valign=\"top\" style=\"width: 0.734214%;\"\u003e\u003ca href=\"http:\/\/unihedron.com\/projects\/sqm-lu\/whatyouget.jpg\"\u003e\u003cimg src=\"http:\/\/unihedron.com\/projects\/sqm-lu\/whatyougeticon.jpg\" border=\"0\" title=\"What you get\" alt=\"\"\u003e\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd valign=\"top\" style=\"width: 99.1189%;\"\u003e\n\u003cul\u003e\n\u003cli\u003eSQM-LU unit\u003c\/li\u003e\n\u003cli\u003eUSB flash drive containing the users manual, operation software (UDM), and example software. This can also be found\u003cspan\u003e \u003c\/span\u003e\u003ca href=\"http:\/\/unihedron.com\/projects\/darksky\/cd\"\u003eonline\u003c\/a\u003e.\u003c\/li\u003e\n\u003cli\u003e15ft USB cable\u003c\/li\u003e\n\u003cli\u003eCalibration sheet indicates unit USB serial number, and calibration values\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003e\n\u003cb\u003eMeter and weatherproof housing\u003c\/b\u003e\u003cspan\u003e\u003c\/span\u003e\n\u003c\/h3\u003e\n\u003ctable width=\"100%\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd valign=\"top\"\u003e\u003ca href=\"http:\/\/unihedron.com\/projects\/sqm-lu\/whatyougeth.jpg\"\u003e\u003cimg src=\"http:\/\/unihedron.com\/projects\/sqm-lu\/whatyougethicon.jpg\" border=\"0\" title=\"What you get\" alt=\"\"\u003e\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd valign=\"top\"\u003e\n\u003cul\u003e\n\u003cli\u003eSQM-LU unit\u003c\/li\u003e\n\u003cli\u003eUSB flash drive containing the users manual, operation software (UDM), and example software. This can also be found\u003cspan\u003e \u003c\/span\u003e\u003ca href=\"http:\/\/unihedron.com\/projects\/darksky\/cd\"\u003eonline\u003c\/a\u003e.\u003c\/li\u003e\n\u003cli\u003e15ft USB cable\u003c\/li\u003e\n\u003cli\u003eCalibration sheet indicates unit USB serial number, and calibration values\u003c\/li\u003e\n\u003cli\u003eWeatherproof housing\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch3\u003eWarranty \u0026amp; Manual\u003c\/h3\u003e\n\u003cp\u003eWarranty: Unihedron Warranty\u003c\/p\u003e","brand":"Unihedron","offers":[{"title":"Unihedron Sky Quality Meter - LU","offer_id":46118652281061,"sku":"UH-SQM-LU","price":294.0,"currency_code":"CAD","in_stock":true},{"title":"Unihedron Sky Quality Meter - LU+H","offer_id":46118652313829,"sku":"UH-SQM-LUH","price":356.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/sqmlu_closeup.jpg?v=1777043444","url":"https:\/\/istronomyplus.com\/products\/unihedron-sky-quality-meter-lu-sqm-lu","provider":"Astronomy Plus – Telescopes \u0026 Astrophotography Canada","version":"1.0","type":"link"}