What is the intensity of light human can tolerate?

The minimum intensity of light to be detected by human eye is 10−10W/m2. The number of photons of wavelength 5. 6×10−7m entering the eye, with pupil area 10−6m2, per second for vision will be nearly.

Which intensity of light is good for eyes?

Warm light is best for the eyes. This includes filtered natural light and light produced by incandescent and LED light bulbs.

How many watts can the human eye see?

1 watt at 555 nm = 683.0 lumens To put this into perspective: the human eye can detect a flux of about 10 photons per second at a wavelength of 555 nm; this corresponds to a radiant power of 3.58 x 10-18 W (or J s-1).

How many lumens can damage your eye?

Safe to say the amount of lumens needed to damage your eye is in the tens of thousands, as anything over 4000 will make you squint, and anything in the hundred thousands is in laser territory. A good rule-of-thumb is, if it hurts then look away.

Do LED lights hurt your eyes?

Since LEDs are so bright, there are questions whether or not they can do damage to our eyes if used overtime. Don’t worry, though. The short answer to this is no, they won’t hurt your eyes. This concern comes from the LED bulb’s use of blue light.

How many photons reach your eyes?

About half a billion photons reach the cornea of the eye every second, of which about half are absorbed by the ocular medium. The radiant flux that reaches the retina is therefore ~2*10⁸ photons/s. The luminance of objects in the room can be measured by a simple handheld device called the luminance meter.

How efficient is the human eye?

The maximum efficiency is for light at a wavelength of 0.555 μm. For the human eye adapted for night vision, so called scotopic vision, the maximum efficiency is for light at a wavelength of 0.510 μm. Under scotopic conditions perception of color is extremely weak.