{"product_id":"lighting-calculation-spreadsheet","title":"Lighting Calculation Spreadsheet","description":"\u003cp\u003eA lumen-method calculator for indoor lighting design. Computes the number of luminaires, total power, and average illuminance (lux) based on room geometry, reflectance, mounting height, and maintenance factor.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eFormat:\u003c\/strong\u003e Excel (.xlsx)\u003c\/p\u003e","brand":"NetGoods","offers":[{"title":"Default Title","offer_id":52713661595829,"sku":null,"price":29.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1016\/9761\/8101\/files\/image_3656e830-2fc8-465c-997a-29fa9a8d3560.png?v=1781641571","url":"https:\/\/netgoodspark.myshopify.com\/products\/lighting-calculation-spreadsheet","provider":"NetGoods","version":"1.0","type":"link"}