Member #688920

Member Since: June 5, 2015

Country: United States

  • Everyone's eyes are different, but the colour cones in the eye react to UVA, although the lens typically blocks UV, although this varies with age. The eye can generally see 400 nm perfectly fine, anything less than 400 nm may be attenuated, but the light near 400 nm, although not as easily detected by the human eye, is still detected to a lesser extent. In other words, you should see light at 380 nm, although it will be far fainter than a light of equal power at 400 nm. (The response of the eye to different wavelengths looks like a triple-peaked bell curve, so there is no "hard stop" at either end of the spectrum).

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