2010年12月1日 星期三

Delivered lumens

Delivered lumens and system efficacy--The second important performance criterion is determining the delivered lumens and system efficacy or lumens per Watt (LPW) of the LED system.. Colour changing kits are often preferred in these environments. They have a control box, which can be set steelersjerseys to give fast or slow colour changes, be frozen on one colour, or be sound activated. This will enable you to determine if an LED solution can meet your lighting objectives effectively and efficiently. Manufacturers’ published data is a good source for this information, and it is important to seek data that is tested and reported in accordance with established industry standards. Specifically, ask the luminaire manufacturer for performance reports that have been derived in accordance with IESNA LM-79-08.

IESNA LM-79-08 (Electrical and Photometric Measurement of Solid-State Lighting Products) is a testing method to measure the performance of LED-based luminaires. This method is termed absolute photometry because the results are actual or “absolute,” not “relative” or scaled to a source that was not actually tested., brake system, and drive line personalizedgifts system are very complicated as they are composed of various parts with totally different function. Lighting system, The limitation of absolute photometry is that it is applicable only for the exact luminaire/light source combination tested.

For first-level comparisons, the LM-79-08 report format summarizes delivered lumens (aka luminaire lumens) as a basis for comparison of LED luminaires rather than the traditional measure of fixture efficiency.There are many advantages of white supplyforyou light LED lights compared with the previous ones. Firstly, it is adjustable in both the brightness and the color, which can meet the demands of interior lighting.. The life span of an hiphonei9 ranges from 20,000 to 50,000 hours compared to 1000-2000 hours for incandescent bulbs. To put this in perspective, if you use your LED Lamp for 2 hours per day, the light will last from 27-68 years! In addition,. Because LED lights have advantages like low emission and low energy dissipation, besides, it also has tenth of the last2010 energy dissipation of the common lamps. As a result, it has much more attention from both consumers and specialists. the metric of delivered (luminaire) lumens is common to both absolute and relative photometry and therefore allows for a direct comparison of LED versus non-LED luminaires—at least with regard to delivered lumens and light distribution. Also, the LM-79-08 format provides system input watts based on the actual (or absolute) set of LED components. This allows for more accurate assessment of system efficacy or LPW.

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