You Never Knew about Lumens Led Light

You Never Knew about Lumens Led Light

Lumens, a physical unit of luminous flux, are defined in physics as the total luminous flux emitted by a candle at a solid Angle.

It is defined in terms of the Candela spherical Angle (CD times sr). A lumen is a unit of light-emitting at an Angle of 1 sphere, emitting an equal amount of energy from the source in all directions, with an intensity of 1 CD.

1 lumen is equal to the electromagnetic energy (EM) radiated from 1.46 milliwatts (1.46 x 10^-3W) at 540 terahertz (540 THz or 5.40 x 10 Hz) frequency. Reduced to SI units, 1 lumen is 0.00146 kilograms square meters per second to the third power (1.46 x 10 kilograms times m/s).

Lumen application in projector

Whether it is a halogen lamp or other high-tech light source, there is a certain number of lux of light flux per watt. Therefore its lumen is proportional to electric power, brightness (lumen) is higher, power consumption is bigger, heat dissipation is bigger, the exhaust air volume is bigger, noise is bigger, and cost can be improved somewhat.

In addition, the nominal brightness of the projection light source is the maximum brightness of the light source, in use for some time, there will be more obvious attenuation.

In the selection of household projector, one should pay attention not to choose too high brightness products, such as more than 4000LM, in the general family use, the night can feel dazzling and difficult to accept. But do not choose too low brightness products, if less than 1300LM, can only be used in the evening, in the daytime without full shading curtain can not be used, and in the bulb brightness attenuation, but also can not get bright images.

We can choose products with brightness levels of 1500-3000 lumens. Although products with higher brightness levels have shorter bulb life and greater attenuation, they are generally more economical.

Open economic mode, 3000LM machine can be operated by 2000- 2500LM, in the evening use, can get the appropriate brightness, can prolong the service life of the bulb, noise reduction, and energy-saving, so you can look forward to brightness (lumens) based on some brightness (lumens) to choose.

In principle, the higher the lumens, will be better! However, the increase of led headlights is achieved by increasing the current, and the greater the current, the greater the amount of light.

1. A LED chip in the light at the same time, will emit heat at the same time, the increase of current and the increase of heat is proportional to the increase of the lamp body heat dissipation area and heat dissipation determines the maximum heat dissipation if the current is too large, the heat generated beyond the maximum heat dissipation of the radiator, which lamp beads are easy to burn out.

2. the LED chip is also very afraid of heat, the chip working junction temperature can not exceed 125 degrees, if the heat dissipation is not good, the chip temperature is too high, and soon will be light decay, leading to LED chip burnout.

3. the higher the lumen, the greater the corresponding current, that is, the greater the power, the original car halogen lamp design is 55/60 watts, too high power will make the line heat, accelerate the aging of the line, easy to cause accidents.

Therefore, the lumens led lights is not the higher the better, but the maximum power is within 55W, without damage to the line, and within the range of heat control, it is the best.

Forest Lighting has been producing LED lights for 25 years, only doing the most professional things