Led Light Intensity Formula

The full luminous intensity 100 is only achieved exactly in the center of the light circle.

Led light intensity formula. The intensity or brightness of light as a function of the distance from the light source follows an inverse square relationship. Suppose you were to use a light meter to measure an initial intensity i i or brightness a distance r from a light source suppose that some time later the brightness of the light is either greater or lesser. Result may defer. To calculate an led s power use simply multiply the led s voltage in volts by the led s current in amperes.

The result of this calculation will be a value expressed in μwsec cm. Anatomy of an led strip. A light emitting diode led is a semiconductor light source that emits light when current flows through it. Use our light requirement calculator to find out maximum led light output lumen and wattage required to illuminate your room depending on type size and specified light level.

Luminous intensity is another term for the brightness but it is related to the solid angle the luminous flux in lumens can only be used to measure the total light emitted by the lamp. Electrons in the semiconductor recombine with electron holes releasing energy in the form of photons the color of the light corresponding to the energy of the photons is determined by the energy required for electrons to cross the band gap of the semiconductor. The luminous intensity on the other hand can be used to indicate the luminous flux per angular unit the unit for luminous intensity is candela and is abbreviated as cd. You can usually find this number on the bulb packaging.

The unit mcd or millicandela is a standard unit for measuring the intensity of a light source. Besides the beam angle there is also the so called field angle in the light circle the beam angle defines the area where the lamp radiates at least half 50 of its maximum luminous intensity. They can be cut to specific lengths using just a pair of scissors along the cutlines located every 1 2 inches. More on brightness as a function of distance.

Beam angle and field angle. An led strip light is typically half an inch 10 12 mm in width and up to 16 feet 5 meters or more in length. Start with 20 or 30 seconds. For example if your led has a voltage of 3 6 and a current of 20 milliamperes it will use 72 milliwatts of power.

This lumen calculation formula is using predefined standard lux levels required for different room types. Using the foot candle calculator. The meter will display the uv intensity in μw cm. This led has an maximum intensity of 200 mcd which means it s just bright enough to get your attention but not quite flashlight bright.

To do it use the formula below. It s a much better indicator of the bulb s luminosity than the wattage as led lights often need less power than regular light bulbs. Uv dose uv intensity μw cm x exposure time seconds exposure time is how long the uv light is on and delivering uv to a surface. Bl stands for the number of lumens that a light bulb emits.

Illumination intensity low medium.