{"product_id":"unihedron-sky-quality-meter-lu-dl-sqm-lu-dl","title":"Unihedron Sky Quality Meter - LU-DL (SQM-LU-DL)","description":"\u003ch3\u003eUnihedron Sky Quality Meter - LU-DL\u003c\/h3\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cimg title=\"Click for close-up\" alt=\"Sky Quality Meter-LU-DL\" align=\"left\" border=\"0\" src=\"http:\/\/unihedron.com\/projects\/sqm-lu-dl\/sqmludl.jpg?width=700\"\u003e\u003c\/td\u003e\n\u003ctd valign=\"top\" with=\"100%\"\u003e\n\u003cp\u003e\u003cb\u003eA USB enabled data-logging light meter for night-time sky brightness monitoring!\u003c\/b\u003e\u003c\/p\u003e\n\u003cp\u003eAn affordable meter for continual, connected or autonomous data-logging to measure sky brightness for astronomers and light pollution investigators.\u003c\/p\u003e\n\u003cp\u003eThe \"Sky Quality Meter - LU-DL\" (SQM-LU-DL) 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\u003chr\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cb\u003eUses:\u003c\/b\u003e\n\u003cul\u003e\n\u003cli\u003eMeasuring the night sky brightness during remote biological field experiments.\u003c\/li\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\u003eClear Sky Clock.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCCD\u003c\/strong\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\u003cstrong\u003eADC\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003elevel.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/td\u003e\n\u003ctd valign=\"top\"\u003e\n\u003cimg title=\"Click for close-up\" src=\"http:\/\/unihedron.com\/projects\/sqm-lu-dl\/DLcontrols.jpg?width=700\"\u003e\u003cspan\u003e\u003cbr\u003eSQM-LU-DL control panel\u003c\/span\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\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\u003eAll the features of our SQM-LU (USB model) plus Data logging capabilities.\u003c\/li\u003e\n\u003cli\u003eOpen protocol\u003cspan\u003e \u003c\/span\u003edocument.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch3\u003e\n\u003cb\u003eTechnical Specifications\u003c\/b\u003e\u003cspan\u003e\u003c\/span\u003e\n\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\u003eAnnotated FOV spec.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eComparison chart\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e.\u003c\/li\u003e\n\u003cli\u003eSize 5.5 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\u003ePowered by external battery pack (included) for field data logging, or USB data cable for computer powered data logging using UDM, or 5V USB \"phone\" charger for mains powered data logging (see charger requirements\u003cspan\u003e \u003c\/span\u003ehere).\u003c\/li\u003e\n\u003cli\u003eRecording memory capacity: 1048576 records total.\u003c\/li\u003e\n\u003cli\u003eSpecifications are subject to change without notice.\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\u003eDiagram of all SQM meters that fit into housing (PDF)\u003c\/li\u003e\n\u003cli\u003ePhotos\u003c\/li\u003e\n\u003cli\u003eGlass versions (PDF)\u003c\/li\u003e\n\u003cli\u003eSQM-LE wiring layout inside housing.\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 (Linksys WAPPOE-5V or D-Link DWL-P200 or TL-POE200) for extended length SQM-LE installations.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eIn the Box\u003c\/h3\u003e\n\u003cp\u003e\u003cb\u003eWhat you get (meter only):\u003c\/b\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eSQM-LU-DL 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\u003eonline.\u003c\/li\u003e\n\u003cli\u003e15ft USB cable\u003c\/li\u003e\n\u003cli\u003eBattery-to-USB adapter with 6 AA cells and battery holder\u003c\/li\u003e\n\u003cli\u003eCalibration sheet indicates unit USB serial number, and calibration values\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cb\u003eWhat you get (with housing):\u003c\/b\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ctable width=\"100%\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd valign=\"top\"\u003e\u003cimg src=\"http:\/\/unihedron.com\/projects\/sqm-lu-dl\/whatyouget-whousing-icon.jpg?width=700\" border=\"0\" title=\"What you get (with housing)\" alt=\"\"\u003e\u003c\/td\u003e\n\u003ctd\u003e\n\u003cul\u003e\n\u003cli\u003eSQM-LU-DL 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\u003eonline.\u003c\/li\u003e\n\u003cli\u003e15ft USB cable\u003c\/li\u003e\n\u003cli\u003eBattery-to-USB adapter with 6 AA cells and battery holder\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\u003ch3\u003eWarranty \u0026amp; Manual\u003c\/h3\u003e\n\u003cp\u003eWarranty: Unihedron Warranty\u003c\/p\u003e","brand":"Unihedron","offers":[{"title":"Unihedron Sky Quality Meter - LU-DL (SQM-LU-DL)","offer_id":48958634852526,"sku":"tff1787937726508","price":223.74,"currency_code":"USD","in_stock":true},{"title":"Unihedron Sky Quality Meter - LU-DL+H (SQM-LU-DLH)","offer_id":48958634885294,"sku":"fts1787937726509","price":204.88,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0695\/2727\/3646\/files\/unihedron-sky-quality-meter---lu-dl-sqm-lu-dl_1.png?v=1787937735","url":"https:\/\/www.pleasantparcel.shop\/products\/unihedron-sky-quality-meter-lu-dl-sqm-lu-dl","provider":"My Store","version":"1.0","type":"link"}