If you are not standing in a completely open place, then lights, trees or buildings on the edge will soon be included in the measurement. The Unihedron sky quality meter SQM-L has a lens for this, allowing it to look at a smaller part of the sky. This way you can more precisely determine the brightness of the night sky, in magnitude per square arcsecond.<\/p>\n\n\n\n
This also allows you to measure in a certain direction, for example towards the skylight of a city. This way you can see how strong the light pollution is in your area, which helps with decisions like whether to install a solar panel or not. filter against light pollution<\/a> or a darker area of observation.<\/p>\n\n\n\n Keep the meter still during the measurement and take a few measurements in succession; then you will automatically see whether the value is stable. When comparing measurements, always aim for the same height and in the same direction.<\/p>\n\n\n\n If you also want to measure with a filter, there is a filter adapter for the SQM-L<\/a>. If you prefer to measure automatically all night long, then look at the SQM-LU with USB<\/a>.<\/p>","protected":false},"excerpt":{"rendered":" Version of the Sky Quality Meter with a lens, which measures a smaller area of sky and therefore suffers less from lights or trees nearby.<\/p>","protected":false},"featured_media":113788,"comment_status":"open","ping_status":"closed","template":"","meta":{"_acf_changed":false},"product_brand":[3298],"product_cat":[56],"product_tag":[],"class_list":["post-113789","product","type-product","status-publish","has-post-thumbnail","product_brand-unihedron","product_cat-telescoop-accessoires","first","instock","taxable","shipping-taxable","purchasable","product-type-simple"],"bundled_by":[],"bundle_stock_status":"instock","bundle_stock_quantity":null,"bundle_virtual":false,"bundle_layout":"","bundle_add_to_cart_form_location":"","bundle_editable_in_cart":false,"bundle_sold_individually_context":"","bundle_item_grouping":"","bundle_min_size":"","bundle_max_size":"","bundle_price":[],"bundled_items":[],"bundle_sell_ids":[],"acf":[],"jetpack_sharing_enabled":true,"jetpack-related-posts":[{"id":113811,"url":"https:\/\/www.telescoop.nl\/en\/filteradapter-voor-sky-quality-meter-sqm-l-sqm-le-en-sqm-lu-unihedron\/","url_meta":{"origin":113789,"position":0},"title":"Filter adapter for Sky Quality Meter SQM-L, SQM-LE and SQM-LU | Unihedron","author":"Info telescoop","date":"09-10-2026","format":false,"excerpt":"Adapter for a filter for the lens of the SQM-L, SQM-LE or SQM-LU, to measure the sky brightness even with a filter.","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/10\/63928_1.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/10\/63928_1.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/10\/63928_1.jpg?resize=525%2C300&ssl=1 1.5x"},"classes":[]},{"id":113795,"url":"https:\/\/www.telescoop.nl\/en\/unihedron-sky-quality-meter-sqm-lu-met-lens-en-usb-voor-je-computer\/","url_meta":{"origin":113789,"position":1},"title":"Unihedron Sky Quality Meter SQM-LU with lens and USB for your computer","author":"Info telescoop","date":"09-10-2026","format":false,"excerpt":"Sky Quality Meter with a lens that you attach to your laptop via USB, so you can capture the darkness of the sky for an entire night.","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/10\/48172_1.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/10\/48172_1.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/10\/48172_1.jpg?resize=525%2C300&ssl=1 1.5x"},"classes":[]},{"id":113791,"url":"https:\/\/www.telescoop.nl\/en\/unihedron-sky-quality-meter-sqm-le-met-lens-en-ethernet-voor-vaste-opstelling\/","url_meta":{"origin":113789,"position":2},"title":"Unihedron Sky Quality Meter SQM-LE with lens and Ethernet for fixed installation","author":"Info telescoop","date":"09-10-2026","format":false,"excerpt":"Sky Quality Meter with lens and network connection for a fixed measuring location, which allows you to measure and read the results all night via your computer.","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/10\/20965_1.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/10\/20965_1.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/10\/20965_1.jpg?resize=525%2C300&ssl=1 1.5x"},"classes":[]},{"id":113787,"url":"https:\/\/www.telescoop.nl\/en\/unihedron-sky-quality-meter-sqm-handmeter-voor-de-donkerte-van-de-nachthemel\/","url_meta":{"origin":113789,"position":3},"title":"Unihedron Sky Quality Meter SQM, hand-held meter for the darkness of the night sky","author":"Info telescoop","date":"09-10-2026","format":false,"excerpt":"Unihedron\u2019s hand meter that shows in one number how dark the night sky is, so you can honestly compare places and nights.","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/10\/20963_1.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/10\/20963_1.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/10\/20963_1.jpg?resize=525%2C300&ssl=1 1.5x"},"classes":[]},{"id":113800,"url":"https:\/\/www.telescoop.nl\/en\/unihedron-sky-quality-meter-sqm-lu-dl-met-lens-usb-en-datalogger\/","url_meta":{"origin":113789,"position":4},"title":"Unihedron Sky Quality Meter SQM-LU-DL with lens, USB and data logger","author":"Info telescoop","date":"09-10-2026","format":false,"excerpt":"Sky Quality Meter that measures itself at fixed times and stores the values, for long measurement series without a laptop next to it.","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/10\/48182_1.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/10\/48182_1.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/10\/48182_1.jpg?resize=525%2C300&ssl=1 1.5x"},"classes":[]},{"id":113806,"url":"https:\/\/www.telescoop.nl\/en\/filteradapter-125-inch-voor-sky-quality-meter-sqm-lu-dl-unihedron\/","url_meta":{"origin":113789,"position":5},"title":"1.25 inch filter adapter for Sky Quality Meter SQM-LU-DL | Unihedron","author":"Info telescoop","date":"09-10-2026","format":false,"excerpt":"Adapter to attach a 1.25 inch filter to the lens of the SQM-LU-DL, for measurements in a part of the spectrum.","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/10\/48208_1.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/10\/48208_1.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/10\/48208_1.jpg?resize=525%2C300&ssl=1 1.5x"},"classes":[]}],"_links":{"self":[{"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/product\/113789","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/comments?post=113789"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/media\/113788"}],"wp:attachment":[{"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/media?parent=113789"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/product_brand?post=113789"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/product_cat?post=113789"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/product_tag?post=113789"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}