Форум (онлайн-игры, travian).

undertaker: technology, nanchang nanchang nanchang people's government taiwan affairs office of taiwan investment enterprises association exhibition service co., ltd. nanchang think chong supported by: minisy of commerce of the prc state adminisation of taxation adminisation of the prc state adminisation for indusy of the prc state adminisation of radio, china national tourism adminisation of china international ade promotion committee china federation of indusy of china federation of indusial economics jiangxi provincial people's government of anhui province people's government of henan province people's government of shanxi province provincial people's government of hubei province people's government of hunan provincial people's government  .los angeles neon signs (http://www.flashingboards.com/)
compared with conventional light sources, such as luminous case, led light point size is very small, the beam angle is also smaller, so its easy to conol the direction of light emitted, but on the other hand, is usually very high surface brightness led light intensity is more concenated, intensity disibution at the maximum, if not handled properly can easily cause glare to the observer. studies have shown that glare will not only cause discomfort decline in efficiency, but also cause visual fatigue and headaches and other adverse reactions. therefore, in indoor applications, its primary and secondary lamps have a high optical design requirements. in addition, as the narrow specal .neon signs wholesale (http://www.flashingboards.com/)
the energy of photons of different wavelengths is different e, power to ansform light energy is necessarily a loss, the following example to illusate: for example, a d = 630nm of gainalp into the four-orange led, the forward bias for the vf & asym2.2v so it means that an elecon and a hole carrier compound into a desired elecic potential energy er = 2.2ev, and a d = 630nm photons into potential energy as e = hc / into d & asym1240/630 & asym1.97ev, so power to the light energy conversion efficiency n (el) = 1.97/2.2 & time100% & asym90%, that is 0.0.23ev energy loss (ev as the elecon volts.) if a 470nm of gan blue led, the vf & asym3.4v, so easym3.4eev, and easym1240/470 & asym2.64ev, so = 2.64/3.4 & time100% & asym78%, which is assumed nint = 100% at the time. if nint = 60%, while the red led, n (el) = 90% & time60% = 54%, while for the blue led is a n (el) b = 78% & time60% = 47s%. business signs (http://www.flashingboards.com/)