There is an issue to consider with this, and I do not know if you remember that in high school I showed as water refracted light, causing the rod that we introduce in the water appears bent with respect to which it is in contact with air. This physical phenomenon is called refraction, and is a change of direction experienced a wave when changing propagation medium.

Besides changing the direction of light, also causes losses because of the diverted flow path and part is reflected in the material surface where light penetrates. All this is to explain that according to the design of the optical panel, efficiency will be better or worse. The good thing is that we can reduce the rate of LED panel’s just two groups: direct illumination LED panels and LED panel’s indirect lighting. Its angle is usually determined by small guide reflective material, and the screens which is held by a control function more glare light output routing. They are very efficient, since the light hardly changes direction, and can easily reach 105 lumens per watt consumed.

LED indirect lighting panels.

In such panels, LEDs are oriented horizontally, so that illuminate a multilayer film of a synthetic material having the property of changing very abruptly light angle, using compounds with appropriate refractive indices, or crystalline materials with transverse optical fibers that redirect light. This sheet is preceded by a target material that reflects part of the light from the LEDs that can go up. Nevertheless, these panels have many losses of luminous flux, at least when compared with their counterparts in direct lighting. A panel of indirect lighting is more aesthetic and its emission is more uniform, but nevertheless, in the best efficiency of such panels usually does not exceed 80 Lm / W.

Offer LED panel

In this particular case, <a href="http://clean-energysystems.com/">Clean Energy Systems</a> note lumens per watt declared, which the seller is 100 but we know perfectly well that is not true, because even if the type of LED and electronics possess a good quality, consider that the optical system of this round of indirect lighting panel, a lost cause at least 18% of the luminous flux emitted by the LED inside the panel.

Another issue that stands out is the economic return of the speaker seller calculation somewhat curious since, nor the KWh charging twice the highest rate in Spain, approaches similar amount. It is convenient to create false expectations, this type of advertising all that does is disappoint the customer.

Another consideration that <a href="http://clean-energysystems.com/">Clean Energy Systems</a> miss the number of LEDs that has the panel. Not the same as a 20W bulb with 50 LEDs, another with the same type of LED, the same power, but has twice LEDs. In the second case, the LED operates with much lower current, which optimizes efficiency, extends shelf life and maintain a more stable color temperature and it reduces the chances of breakdowns since the LED will not reach high temperatures.


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