Light Intensity Calculator

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Light Intensity Calculator:

Enter the values of number of sources, n, frequency, f(Hz), luminous energy, h(J), area, A(m2),and time, t(s) to determine the value of Light Intensity, I(W/m2).

Enter Number of Sources :
Enter Frequency: Hz
Enter Luminous Energy: J
Enter Area: m2
Enter Time: s
   
Result -Light Intensity: W/m2

Light Intensity :

Light intensity is a measure of the power of light received per unit area. It indicates how bright or strong a light source appears at a particular point and is commonly measured in lux (lumens per square meter) or watts per square meter. Light intensity plays a vital role in fields like photography, agriculture, physics, and vision science.

It determines the effectiveness of lighting in spaces like homes, offices, greenhouses, and laboratories. Light intensity can be influenced by the source’s power, the distance from the source, the angle of incidence, and the medium through which it travels.

Light intensity is also influenced by the total luminous energy (h) emitted by the source, the number of sources (n), and the frequency (f) of their operation. Surface area (A) receiving the light and the time duration (t) over which light is spread are inversely proportional to intensity.

Proper measurement and control of light intensity ensure optimal performance in both scientific and practical applications. It helps regulate plant growth, set safety standards, and improve visibility. Dim or excessive lighting can lead to errors, discomfort, or health issues, making intensity control essential.

Maintaining the right level of light intensity supports energy efficiency and visual comfort. Measurement instruments like lux meters are commonly used to evaluate it.Calculating intensity helps in designing lighting systems and conserving power.

Light Intensity, I(W/m2) in watts per square metre equals number of sources, nmultiplied by frequency, f(Hz) in hertz, multiplied by luminous energy, h(J) in joules, divided by area, A(m2) in square metres and time, t(s) in seconds.

Light Intensity, I(W/m2)= n * f(Hz) * h(J)/ A(m2)* t(s)

I(W/m2)= light intensity in watts per metre square, W/m2.

n = number of sources.

f(Hz)= frequency in Hertz, Hz.

h(J) = luminous energy in Joules, J.

A(m2)= area in square metres, m2.

t(s)= time in seconds, s.

Light Intensity Calculation:

  1. A room uses 2 light sources (n), each operating at a frequency of 60 Hz (f), with a luminous energy output of 300 joules (h). The area (A) is 10 m2 and the lights are on for 50 seconds (t). What is the light intensity?

Given: n = 2, f(Hz)= 60Hz, h(J) = 300J, A(m2)= 10m2, t(s)=  50s.

Light Intensity, I(W/m2)= n * f(Hz) * h(J)/ A(m2)* t(s)

I(W/m2)= 2 * 60 * 300 / 10 * 50

I(W/m2)= 36000 / 500

I(W/m2)= 72W/m2.

  1. A system produces a light intensity (I) of 90 watts/m2 over an area of 15 m2 for 40 seconds. The luminous energy (h) is 450 J, and the frequency (f) is 50 Hz. Find the number of light sources (n).

Given: I(W/m2)= 90W/m2, f(Hz)= 50Hz, h(J) = 450J, A(m2)= 15m2, t(s)=  40s.

Light Intensity, I(W/m2)= n * f(Hz) * h(J)/ A(m2)* t(s)

n = I(W/m2)*A(m2)* t(s)/ f(Hz) * h(J)

n = 90 * 15 * 40 / 50 * 450

n = 54000 / 22500

n = 2.4.

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