Pengukur cahaya adalah alat yang digunakan untuk mengukur jumlah cahaya. Dalam fotografi, pengukur cahaya (lebih tepatnya pengukur pencahayaan) digunakan untuk menentukan pencahayaan yang tepat untuk sebuah foto. Meteran akan mencakup kalkulator digital atau analog yang menampilkan kecepatan rana dan f-number yang benar untuk pencahayaan optimal, mengingat situasi pencahayaan dan kecepatan film tertentu. Demikian pula, pengukur pencahayaan juga digunakan dalam bidang sinematografi dan desain pemandangan, untuk menentukan tingkat cahaya optimal untuk pemandangan.
Pengukur cahaya digunakan dalam bidang umum desain pencahayaan arsitektural untuk memverifikasi pemasangan dan kinerja sistem pencahayaan bangunan yang tepat, dan dalam menilai tingkat cahaya untuk tanaman yang sedang tumbuh.
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