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2. Luminance - Wikipedia

   en.wikipedia.org/wiki/Luminance

   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.

3. Everything You Need to Know About Acne, from Causes to Treatment

   www.aol.com/everything-know-acne-causes...

   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.

4. Light therapy - Wikipedia

   en.wikipedia.org/wiki/Light_therapy

   Light therapy is a mood altering treatment, and just as with drug treatments, there is a possibility of triggering a manic state from a depressive state, causing anxiety and other side effects. While these side effects are usually controllable, it is recommended that patients undertake light therapy under the supervision of an experienced ...

5. Photometry (optics) - Wikipedia

   en.wikipedia.org/wiki/Photometry_(optics)

   Luminance (photometric) and radiance (radiometric) Luminous flux (photometric) and radiant flux (radiometric) Luminous intensity (photometric) and radiant intensity (radiometric) In photometric quantities every wavelength is weighted according to how sensitive the human eye is to it, while radiometric quantities use unweighted absolute power.

6. Luminous intensity - Wikipedia

   en.wikipedia.org/wiki/Luminous_intensity

   Light with the same radiant intensity at other wavelengths has a lower luminous intensity. The curve which represents the response of the human eye to light is a defined standard function y (λ) or V (λ) established by the International Commission on Illumination (CIE, for Commission Internationale de l'Éclairage ) and standardized in ...

7. Best butt acne treatments - AOL

   www.aol.com/news/best-butt-acne-treatments...

   Recommended as one of the best treatments for teen acne, these First Aid Beauty facial pads are made for sensitive skin because they can gently exfoliate using an alcohol-free (non-drying) formula ...