{"id":1546,"date":"2012-12-07T00:00:00","date_gmt":"2012-12-07T00:00:00","guid":{"rendered":"https:\/\/www.ganymedes.nl\/product\/ethernet-sky-quality-meter-with-lens-sqm-le\/"},"modified":"2026-02-06T13:30:26","modified_gmt":"2026-02-06T12:30:26","slug":"ethernet-sky-quality-meter-with-lens-sqm-le","status":"publish","type":"product","link":"https:\/\/dev4-ganymedes.nl\/en\/product\/ethernet-sky-quality-meter-with-lens-sqm-le\/","title":{"rendered":"Ethernet Sky Quality Meter with Lens (SQM-LE)"},"content":{"rendered":"<p>Ethernet Sky Quality Meter with Lens (SQM-LE)<\/p>\n<p><span class=\"JLqJ4b ChMk0b\" data-language-for-alternatives=\"nl\" data-language-to-translate-into=\"en\" data-phrase-index=\"0\">Een ethernet-enabled SQM-model voor het bewaken van de nachtelijke hemelhelderheid!<\/span> <span class=\"JLqJ4b ChMk0b\" data-language-for-alternatives=\"nl\" data-language-to-translate-into=\"en\" data-phrase-index=\"2\">Een betaalbare meter voor continue, geconnecteerde meting van de hemelhelderheid voor astronomen!<\/span> <span class=\"JLqJ4b ChMk0b\" data-language-for-alternatives=\"nl\" data-language-to-translate-into=\"en\" data-phrase-index=\"4\">De &#8220;Sky Quality Meter &#8211; LE&#8221; meet de helderheid van de nachtelijke hemel in magnitudes per vierkante boogseconde<\/span><\/p>\n<p><span style=\"font-family: Arial, Verdana, Helvetica\"><b>Uses:<\/b><\/span><\/p>\n<ul>\n<li><span style=\"font-family: Arial, Verdana, Helvetica\"><span style=\"font-family: Arial, Verdana, Helvetica\">Find out how good the night or site REALLY is.<\/span><\/span><\/li>\n<li><span style=\"font-family: Arial, Verdana, Helvetica\"><span style=\"font-family: Arial, Verdana, Helvetica\">Compare the sky brightness at different sites quantitatively.<\/span><\/span><\/li>\n<li><span style=\"font-family: Arial, Verdana, Helvetica\"><span style=\"font-family: Arial, Verdana, Helvetica\">Document the evolution of light pollution in your area.<\/span><\/span><\/li>\n<li><span style=\"font-family: Arial, Verdana, Helvetica\"><span style=\"font-family: Arial, Verdana, Helvetica\">Set planetarium dome illumination to mimic the skies people are likely to experience elsewhere in the city.<\/span><\/span><\/li>\n<li><span style=\"font-family: Arial, Verdana, Helvetica\"><span style=\"font-family: Arial, Verdana, Helvetica\">Monitor sky brightness through the night, night-to-night, and year-to-year.<\/span><\/span><\/li>\n<li><span style=\"font-family: Arial, Verdana, Helvetica\"><span style=\"font-family: Arial, Verdana, Helvetica\">Determine which nights show the greatest promise for finding the &#8216;faintest fuzzies&#8217;!<\/span><\/span><\/li>\n<li><span style=\"font-family: Arial, Verdana, Helvetica\"><span style=\"font-family: Arial, Verdana, Helvetica\">Calibrate the effect of sky brightness on qualitative measures such as the Bortle Scale.<\/span><\/span><\/li>\n<li><span style=\"font-family: Arial, Verdana, Helvetica\"><span style=\"font-family: Arial, Verdana, Helvetica\">Investigate how sky brightness correlates with the solar cycle and month-to-month sunspot activity.<\/span><\/span><\/li>\n<li><span style=\"font-family: Arial, Verdana, Helvetica\"><span style=\"font-family: Arial, Verdana, Helvetica\">Help provide local ground truth for future sky brightness prediction with the <a href=\"https:\/\/www.ganymedes.nl\/26\" target=\"_blank\" rel=\"noopener noreferrer\">Clear Sky Clock<\/a>.<\/span><\/span><\/li>\n<li><span style=\"font-family: Arial, Verdana, Helvetica\"><span style=\"font-family: Arial, Verdana, Helvetica\"><a title=\"Charge-Coupled Device (type of image sensor)\"><b>CCD<\/b><\/a> users can make a correlation between the SQM reading and when the background reaches some <a title=\"Analog-to-Digital Converter\"><b>ADC<\/b><\/a> level.<\/span><\/span><\/li>\n<\/ul>\n<p><span style=\"font-family: Arial, Verdana, Helvetica\"><b>Features:<\/b> <\/span><\/p>\n<ul>\n<li><span style=\"font-family: Arial, Verdana, Helvetica\"><span style=\"font-family: Arial, Verdana, Helvetica\">Sky brightness reported in visual magnitudes per square arcsecond.<\/span><\/span><\/li>\n<li><span style=\"font-family: Arial, Verdana, Helvetica\"><span style=\"font-family: Arial, Verdana, Helvetica\">Infrared blocking filter restricts measurement to visual bandpass.<\/span><\/span><\/li>\n<li><span style=\"font-family: Arial, Verdana, Helvetica\"><span style=\"font-family: Arial, Verdana, Helvetica\">Sensor temperature, model number, and serial number are provided.<\/span><\/span><\/li>\n<li><span style=\"font-family: Arial, Verdana, Helvetica\"><span style=\"font-family: Arial, Verdana, Helvetica\">Precision readings at even the darkest sites.<\/span><\/span><\/li>\n<li><span style=\"font-family: Arial, Verdana, Helvetica\"><span style=\"font-family: Arial, Verdana, Helvetica\">Field-upgradeable <a href=\"updates\" target=\"_blank\" rel=\"noopener noreferrer\">firmware<\/a><\/span><\/span><\/li>\n<li><span style=\"font-family: Arial, Verdana, Helvetica\"><span style=\"font-family: Arial, Verdana, Helvetica\">Open protocol <a href=\"cd\/SQM-LE_Users_manual.pdf\" target=\"_blank\" rel=\"noopener noreferrer\">document<\/a><\/span><\/span><\/li>\n<\/ul>\n<h4><span style=\"font-family: Arial, Verdana, Helvetica\"><b>Specificaties van de Ethernet Sky Quality Meter with Lens (SQM-LE) zijn:<\/b><\/span><\/h4>\n<ul>\n<li><span style=\"font-family: Arial, Verdana, Helvetica\"><span style=\"font-family: Arial, Verdana, Helvetica\">Ethernet connectivity<\/span><\/span><\/li>\n<li><span style=\"font-family: Arial, Verdana, Helvetica\"><span style=\"font-family: Arial, Verdana, Helvetica\">Included applications for reading data in Java, C, Perl, Python.<\/span><\/span><\/li>\n<li><span style=\"font-family: Arial, Verdana, Helvetica\"><span style=\"font-family: Arial, Verdana, Helvetica\">The Half Width Half Maximum (HWHM) of the angular sensitivity is ~10\u00b0. The Full Width Half Maximum (FWHM) is then ~20\u00b0.<\/span><\/span><\/li>\n<li><span style=\"font-family: Arial, Verdana, Helvetica\"><span style=\"font-family: Arial, Verdana, Helvetica\">The sensitivity to a point source ~19\u00b0 off-axis is a factor of 10 lower than on-axis.<\/span><\/span><\/li>\n<li><span style=\"font-family: Arial, Verdana, Helvetica\"><span style=\"font-family: Arial, Verdana, Helvetica\">\u00a0A point source ~20\u00b0 and ~40\u00b0 off-axis would register 3.0 and 5.0 magnitudes fainter, respectively.<\/span><\/span><\/li>\n<li><span style=\"font-family: Arial, Verdana, Helvetica\"><span style=\"font-family: Arial, Verdana, Helvetica\">Operates from 5-6VDC adapter (included).<\/span><\/span><\/li>\n<li><span style=\"font-family: Arial, Verdana, Helvetica\"><span style=\"font-family: Arial, Verdana, Helvetica\">Size 3.6 x 2.6 x 1.1 in.<\/span><\/span><\/li>\n<li><span style=\"font-family: Arial, Verdana, Helvetica\"><span style=\"font-family: Arial, Verdana, Helvetica\">Maximum light sampling time: 80 seconds.<\/span><\/span><\/li>\n<li><span style=\"font-family: Arial, Verdana, Helvetica\"><span style=\"font-family: Arial, Verdana, Helvetica\">Minimum light sampling time: 1 seconds.<\/span><\/span><\/li>\n<li><span style=\"font-family: Arial, Verdana, Helvetica\"><span style=\"font-family: Arial, Verdana, Helvetica\">Specifications are subject to change without notice.<\/span><\/span><\/li>\n<\/ul>\n<p><span style=\"font-family: Arial, Verdana, Helvetica\"><b>What you get:<\/b><\/span><\/p>\n<table style=\"height: 174px\" width=\"482\">\n<tbody>\n<tr>\n<td style=\"text-align: left\"><a href=\"https:\/\/www.ganymedes.nl\/32\">\u00a0<\/a><\/td>\n<td>\n<ul>\n<li>SQM-LE unit<\/li>\n<li><a href=\"https:\/\/www.ganymedes.nl\/33\" target=\"_blank\" rel=\"noopener noreferrer\">International Power adapter<\/a><\/li>\n<li>SQM-LE users manual<\/li>\n<li>CD with PDF manual and example software<\/li>\n<li>6ft Ethernet cable (straight through for connection to hub\/router)<\/li>\n<li>6ft Ethernet crossover cable (for connection directly to PC)<\/li>\n<li>Calibration sheet indicates unit MAC address, and calibration values<\/li>\n<\/ul>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p><span class=\"JLqJ4b ChMk0b\" data-language-for-alternatives=\"nl\" data-language-to-translate-into=\"en\" data-phrase-index=\"0\">Een ethernet-enabled SQM-model voor het bewaken van de nachtelijke hemelhelderheid!<\/span><\/p>\n","protected":false},"featured_media":1547,"comment_status":"open","ping_status":"closed","template":"","meta":{"_acf_changed":false,"_vp_format_video_url":"","_vp_image_focal_point":[],"_vp_custom_popup_image":0,"_vp_format_audio_url":"","_vp_custom_thumbnail":0,"_vp_custom_thumbnail_focal_point":[],"_vp_hover_thumbnail":0,"_vp_hover_thumbnail_focal_point":[]},"product_brand":[],"product_cat":[267,382,342,283],"product_tag":[],"class_list":{"0":"post-1546","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-astrophotography-en","7":"product_cat-brands-ganymedes-en","8":"product_cat-brands-en","9":"product_cat-astrophotography-smart-accessories-en","11":"first","12":"onbackorder","13":"taxable","14":"shipping-taxable","15":"purchasable","16":"product-type-simple"},"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Ethernet Sky Quality Meter with Lens (SQM-LE) - Ganymedes<\/title>\n<meta name=\"description\" content=\"Ethernet Sky Quality Meter with Lens (SQM-LE). 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