提防LED十万小时使用寿命之说- LED vs Cold Cathode 每次看到有关LED的报道,总会注明它有十万小时的寿命,这意味你安装它后便可安枕无忧地连续可使用超过11年了,这般通用的声言就让不少人习惯性地接受这是无可非议的事实。 但事实并非如此… 一颗抗UV环氧树脂5mm LED 二极管灯在全电流和高温下工作,在一千小时内它的光输出将会缩减一半... 在建筑照明的应用上,工程维护和能源成本为最关键的因素,因此使用冷阴极管仍是最理想的选择。 让我们以典型的白色LED与直径25mm暖白色冷极管在常规照明应用的情况下做个比较, 下图即为我们展示实验得出的二者的表现。
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LED标榜其专业灯光应用,但并不一定是所有灯光照明的最佳答案。当你分析LED的技术规格或说明书时,你会发现,没有写明的东西比写明的东西更为重要,一定要好好考虑清楚! 冷阴极管已是很成熟和被技术得到证实有很多优点的产品, 因此当我们把所有关键问题都整合在一起考虑,并需要在两者间做个选择的话,很明显地,冷阴极管仍然能提供比LED更多的好处。 注:本文借鉴 Dan Watt先生相关观点和言论
LED vs. Cold Cathode -Beware of the 100,000 hour LED myth Every time you see anything regarding LEDs, it is always stated that they have a 100,000 hour life expectancy. This implies that you can just install them and forget about them for more than 11 years of continuous use. This claim is so common that most people have come to accept it as hard fact. |
LEDs are here to stay for specialty lighting applications, but are not necessarily the best answer to most lighting needs. When looking at a data sheet or specifications for LEDs, what is left out can be more important than what is put in. Do your homework carefully. Source: Dan Watts
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冷阴极管与LED用于灯槽的比较, 作者:Luc Steegmans |
LED在这几年间被应用于很多领域和项目中,它无疑是槽型字、广告牌、家具装饰、自动售卖机以至扶手电梯装饰等之最佳光源,但这些对光的强度和色彩渲染的要求都不大,然而这两点却为暗槽灯/天花照明(Cove Lighting) 所产生的氛围环境的灯光效果之关键因素。 暗槽灯的灯光应该是高亮光且介乎在色温2400K 至 3000K之间。若使用冷阴极管,能产生甚至超过灯管本身长度的高亮光。由于光线均匀分布于灯管表面每处,将不会有任何黑点出现在灯光所照附近。所以如果使冷极管贴合天花的话,整个天花会被很均匀地照亮;如果想效果更佳,你可在暗槽内涂上金漆,这反射的灯光会使装饰效果更金壁辉煌。 然而,以LED本身的条件是很难应用于天花照明的。或者换句话来说,问题在于LED光源与天花之间的距离太近,而LED本身是点光源的缘故,它的光在不足够的距离下很难平均分布于天花的表面。LED本身是带方向性的细小点光源(即局部光源),有任何物体处于光源与墙壁之间,都会产生黑影投射到墙壁上。当然人们可以每米增加更多更密集的LED灯珠,但也是不能完全解决黑影的问题。从节能的角度来说,要达到同样亮度的话,冷极管是比LED要更胜一筹。 再者,色温,尤其是在2400K至3000K之间的色温,LED是很难达到的。人们应该要认识到的是,所谓的某一色温是分列在色谱上某特定的范围内的不同位置都能得出的数值,都可以被称为同一色温,但其实所谓的同一色温不是一定给人同样的感觉。 最后关于保养维护方面,根据30年来的实践经验证明,作为天花暗槽灯照明光源的冷阴极管可以在极少的维护下维持使用很长时间,10年不间断的工作运行也是很普通正常的。但LED的真实平均使用寿命,那就只有未来才能知道了。 虽然它被应用在装饰照明方面才不过四年左右的时间但已出现很多显着的失败事故, 这大概是因为暗槽内的高温对LED的稳定性造成影响。在不能降温的情况下工作对LED来说是非常不利的,而冷阴极管就不会受高温影响。 如果暗槽天花照明是你房间的主要光源的话,就要注意灯光的充足亮度,合适的色温以及最少的维护保养,在这种情况下,冷阴极管毫无疑问比LED更胜一筹。 注:本文借鉴Luc Steegmans乐思迪文先生相关观点和言论
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Cold cathode lighting vs led lighting with coves- by Luc Steegmans In recent years leds have been successfully used in many applications. It has been a suitable solution from channel letters, decorative lighting inside furniture, soft drink vending machines to escalators. Cove light should be intense, and the color should be between 2400°K to 3000°K.? With cold cathode lighting a very intense light can be generated, completely even over the length of the tube(s).? Because the light is evenly generated on every part of the tube surface there won’t be any dark spots on the nearby ceiling so if the tubes were well tailored the ceiling will be illuminated evenly. Light that is not directly projected on the ceiling will be reflected by the cove which gives another possibility to add some impression of gold light by painting the inside of the cove in gold. With the actual state of development of led it is difficult to have evenly illuminated coves, as these are usually shallow and near the ceiling, in other words there is not enough distance to spread the light from the bright light spots into an evenly illuminated surface.? The light from leds is by definition directional light, generated in a tiny point, and any object that will be in between the light source and the wall will result in a dark shadow on the wall or ceiling.? Of course one can increase the number of led modules per meter, but this will not completely remedy dark spots. Also, in terms of energy, for a similar light intensity from cove lighting cold cathode outperforms led. Color temperature, especially in the 2400°K to 3000°K range is very difficult to achieve with leds. One should realize that for a given color temperature there can be various spots in the color triangle that correspond with that figure but these do not necessarily create the same feeling. This is much more under control with cold cathode lighting. Lastly, in terms of maintenance, more than 30 years of experience have proven that cove lighting with cold cathode can last many years with minimal maintenance. 10 years of 24/7 operation is rather common. With led only the future will tell us what the real life expectancy is. Though in this kind of application led is only used since about four years we can only notice the failures. If cove lighting is the main light source in a room then it is necessary to have enough light, with the right color temperature and with little maintenance. At this moment cold cathode lighting can deliver that, rather than led. Source: Luc Steegmans |
冷阴极管光源与日光灯光源及LED光源优缺点对比 一、经济 |
二、使用寿命 |
三、效果 四、维修 |
五、配电设备 冷阴极管实用于室内外装饰照明,输出功率小、省电、经济,能做到舒适、优雅, 光暗对比效果鲜明,更可配合 特定电脑控制系统做出数百种颜色变化。冷阴极管,管长可达3米,更有效提高了冷阴极管与冷阴极管之间的连续性, 减少了暗点,以达到高亮度和美观的效果,其发光明亮、柔和、不刺眼,穿透力强且分布均匀,在雾天其光彩依旧清晰可见。 ※ 冷极管最长寿命50000小时 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * |
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