page_title: Luminous flux
hierarchical_section_title: Luminous flux
caption_attribution_description: luminance chamber for the measurement of luminance power of LED lighting devices
context_page_description: In photometry, luminous flux or luminous power is the measure of the perceived power of light. It differs from radiant flux, the measure of the total power of electromagnetic radiation, in that luminous flux is adjusted to reflect the varying sensitivity of the human eye to different wavelengths of light.
context_section_description: In photometry, luminous flux or luminous power is the measure of the perceived power of light. It differs from radiant flux, the measure of the total power of electromagnetic radiation (including infrared, ultraviolet, and visible light), in that luminous flux is adjusted to reflect the varying sensitivity of the human eye to different wavelengths of light.
caption: Integrating sphere used for measuring the luminous flux of a light source.
exif: {"Image Make": "PENTAX", "Image Model": "PENTAX K-7", "Image Orientation": "Horizontal (normal)", "Image XResolution": "72", "Image YResolution": "72", "Image ResolutionUnit": "Pixels/Inch", "Image Software": "QuickTime 7.6.2", "Image DateTime": "2009:10:25 04:22:12", "Image Artist": "Stephen Woolverton", "Image HostComputer": "Mac OS X 10.5.8", "Image Copyright": "Stephen R Woolverton", "Image ExifOffset": "306", "EXIF ExposureTime": "1/15", "EXIF FNumber": "4", "EXIF ExposureProgram": "Program Normal", "EXIF ISOSpeedRatings": "400", "EXIF ExifVersion": "0220", "EXIF DateTimeOriginal": "2009:10:24 11:04:26", "EXIF DateTimeDigitized": "2009:10:24 11:04:26", "EXIF ExposureBiasValue": "13/10", "EXIF MeteringMode": "Pattern", "EXIF Flash": "Flash did not fire, compulsory flash mode", "EXIF FocalLength": "20", "EXIF FlashPixVersion": "0100", "EXIF ColorSpace": "sRGB", "EXIF ExifImageWidth": "3104", "EXIF ExifImageLength": "4672", "EXIF SensingMethod": "One-chip color area", "EXIF CustomRendered": "Normal", "EXIF ExposureMode": "Manual Exposure", "EXIF WhiteBalance": "Auto", "EXIF FocalLengthIn35mmFilm": "30", "EXIF SceneCaptureType": "Standard", "EXIF Contrast": "Hard", "EXIF Saturation": "Normal", "EXIF Sharpness": "Hard", "EXIF SubjectDistanceRange": "3"}