1, on the light effect of led and nano lamps
In 2007, the best light source of led light can only reach 80lm/w, and the domestic one is even worse. After the luminaire, the actual application of the light effect is even lower. At that stage, most of the led light sources were used as indicator lighting and landscape lighting, and were not promoted in applications such as street lighting. However, some unscrupulous manufacturers and a few departments have hardened their interests in order to cause actual application failure. Such manufacturers still exist today. But this does not mean that the application of led has been this standard. At that time, the computer was still 386, now? See things can't stay in the previous stage, look at the present and the future. Now the OSZ series of light sources that Osram normally ships is 112-130lm/w.
Take the LED street lamp with the light source power of 100w as an example: the initial luminous flux is 11,200lm. Because the LED is unidirectional, the efficiency of the luminaire is high, the lens loss is 10%, and the luminaire loses 10%. The luminous flux of the lamp is 9070lm, and the total power of the lamp is 110w. Therefore, the lighting effect of this LED lamp is 82.5lm/w, and the nano light effect is from 90-140lm/w. However, because it is 360-degree light, the light applied to the illumination direction is very small, only 30%. It is necessary to achieve higher utilization of light by reflecting light in a portion of the non-applied direction. Due to the design and cost of the luminaire, the sodium lamp luminaire is only 40-45% efficient.
Take the 250w sodium lamp as an example: the initial luminous flux is 30000lm, and the luminous flux of the lamp is 13,500lm. The actual power of the 250w sodium lamp is 300w (this will be explained later), so the light efficiency of the 250w sodium lamp is 45lm/w.
Another very big problem with sodium lamp luminaires is that the illumination of sodium lamps is very poor. When the sodium lamp is in working condition, the temperature inside the lamp cavity should exceed 150 degrees. In the non-working state, because of the negative pressure, a lot of dust and insects are sucked in, which greatly affects the light-emitting effect of the sodium lamp.
From the above results, the luminous efficacy of the LED lamps at this stage is better than that of the sodium lamps. With the development and maturity of the LED technology, the luminous efficacy of the lamps will be greatly improved.
2, the actual power of led and sodium lamps
The power composition of the led light source luminaire: light source power + power loss = whole lamp power, now the efficiency of led drive can already achieve 91% or better, and does not need to do reactive power compensation.
The power of the LED lamp of the previous 100w light source: 100+100*(1-0.91)=109w The whole lamp power composition of the sodium lamp is more complicated, because the efficiency of the sodium lamp is only 0.38-0.45, and there is reactive power equal to the swimming power. The apparent power of the 250w sodium lamp without the reactive power compensation is as high as 627va. In order to solve this problem, the reactive power compensation part must be added. Now, the single-lamp local reactive compensation is generally 85%. The sodium lamp inductive rectifier consumes 20%, the electronic rectifier is 10% but costly and has a short life.
The power of the previous 250w sodium lamp: 250+250*20%=300w, there is still no power loss, line loss, transformer loss, etc. on the whole lamp line, so it will not increase in this, only in theory lower Value comparison.
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