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Also important to know: Most acne treatments typically take at least a few weeks to show results, and some may cause an initial “purge” in which the skin gets worse before it gets better.
High-intensity blue light (425 nm) used for the attempted treatment of acne. Light therapy treatments for the skin usually involve exposure to ultraviolet light. [2] The exposures can be to a small area of the skin or over the whole body surface, as in a tanning bed. The most common treatment is with narrowband UVB, which has a wavelength of ...
The sun has a luminance of about 1.6 × 10 9 cd/m 2 at noon. [3] Luminance is invariant in geometric optics. [4] This means that for an ideal optical system, the luminance at the output is the same as the input luminance. For real, passive optical systems, the output luminance is at most equal to the input.
Brightness, the subjective perception elicited by the luminance of a source; Luminance, the photometric equivalent of radiance (lm·sr −1 ·m −2) Photometry (optics), measurement of light, in terms of its perceived brightness to the human eye; Radiometry, measurement of light, in absolute power units; Luminosity