by Fabio Sanguine
In order for LED lighting to be considered an alternative to traditional lighting, it needs to offer sufficient lighting levels and reduced payback times. Once the initial outlay has been paid off, these reduced payback times offer even greater savings.
确定 LED 照明装置投资回报和照度水平涉及到很多因素，其中最重要的因素当属质保、能耗和光通量。
Many factors are involved in determining payback time and lighting levels. Undoubtedly, however, the most relevant factors are those relating to product warranty, light absorption and flux emission.
质保
对于最终用户来说，质保期长是明显的节约，因为减少了设施维护设施的成本。照明装置的制造商倾向于采用高级大功率 LED 产品，因为这样的产品有5年或以上的质保，LED 制造商在签发质保书的同时签发使用中出现的产品维修证书。凭借这些正式文件的支持，照明装置的制造商在使用大功率 LED 时必须按正确温度设定，这样才能得获签发一定等级的质保书。可以设想，使用大功率 LED 时，照明装置制造商一定要在热力学领域上有相当的了解和能力，以求在一定空间范围按当前市场标准配置适当数量的 LED 。因此，使用优质电源在确定质保期的时间长短上起着一定的作用（参见侧图）。
Warranty
An extensive warranty period means significant savings for the end user as maintenance costs are reduced. Device manufacturers tend to use high-end PowerLEDs, as this enables considerable warrantees (lasting 5 or more years) to be issued. This is possible because the manufacturers of LEDs issue them with official documentation on their maintenance in relation to usage. Thanks to this supporting documentation, manufacturers of devices using PowerLEDs can ensure they function at the correct temperatures, which enables a certain level of warrantee to be issued. The use of PowerLEDs thus requires – on the part of the device manufacturer – considerabl
