LM-79 measures a luminaries or integral lamp as a system and measures light output (flux), electrical power, chromaticity, efficacy, and intensity distribution using standard processes and equipment. These five required metrics are mandatory on LED Lighting Facts labels and come from the results of LM-79 Test Lab. As the development of LED technology continues to grow and diversify, the need for consistent and standardized testing procedures for LED has become more prevalent than ever. Light Laboratory is an NIST NVLAP Accredited testing for LM-79.
KC India has made strides to stay current with the new testing standard LM-79 set forth by the IESNA (Illuminating Engineering Society of North America). In addition, "IN-SITU" testing is now a priority when testing our LED light systems for more reliable results.
You are a manufacturer or vendor and want to sell your product in the market. Then you must be needed a test report of your product which will give all the parameters electrical and photometric measurement issued by an NABL accredited laboratory. LM 79 testing will give you a chance to improve your product by amendment in it if required. So, Testing LED luminaries are a necessary task to be performed in this competitive world.
You have to go for LM 79 Testing Labs, even on the usage of Tested LED in your luminary. The LED’s are tested according to LM 80 which is a standard to test only LED’s. But in Luminaries, LED is one of the components used in luminaries. The other components of luminary are electrical, some connections, LED’s, optical, thermal and mechanical that make it a new product and requires testing as per LM-79 Testing which is a standard to test SSL and test the LED luminaries for measurements. To be competitive and for good business, you need to test your product as per LM 79, as most of the purchaser requires a test report and prefer to purchase Tested luminaries only.
Now, it is clear LM 79 Test Lab has a positive impact on the product. In brief, improvement can be expected, quality enhancement, real picture performance criteria of the product, help in enhancing business.
Applies to LED-based products incorporating control electronics and heat sinks, that is, those devices that require only AC mains power or a DC voltage power supply to operate.
LM-79 requires that photometric measurements should be absolute. This means that the test should measure the actual lumen output from the device under test (DUT). This is different from the photometric testing that was conducted in the pre-LED era. In the days of fluorescent tubes and high intensity discharge lamps it was the practice to publish standardized data for a particular lamp and then express the light output from a fixture in terms of its light output ratio (LOR). The LOR expressed the % of the light from the standardized source that was actually emitted from the luminaries, so a fluorescent louver fitting might have had an LOR of 0.7 – meaning that 70% of the light generated by the lamp for which it was designed emerged from the luminaries, so the balance of 30% was lost internally. This made it easy to produce photometric data for a series of light fittings (for example, data for a 4 x 14W and 4 x 21W fixtures could be generated from just one photometric test). This was relative photometry
Absolute photometry, as is required by LM-79, does not recognize the concept of LOR. This is entirely logical because the LED industry is still moving at such a pace in terms of improving efficiencies and product design, that it is not practical to define standardized output data for LEDs.
Before the test can begin the device under test (DUT) should be connected to a suitable, stable, power supply in a draught-free environment. The ambient temperature should be 25º and the fitting should be powered up and its own temperature allowed stabilizing. This will typically take from 30 minutes to 2 hours. LM-79 gives detailed instructions for how the equipment to be used should be set-up, calibrated and used. In brief, LM-79 describes two main types of equipment that may be used – integrating spheres and goniophotometers.
A goniophotometer measures the distribution of the light emitted by a lamp or light fitting. From that data they will also calculate the total luminous flux (the total light output) and some, depending on the sensors they use, can also measure the spectral composition of the light and how that varies at different positions around the device under test (DUT).
LM-79 Test Laboratory with Goniophotometer system: Now, For LID measurements goniophotometer is required, which is generally used for relatively large size SSL products. It also provides the total luminous flux in lumen as well. Dark room is required for installation of Goniophotometer with temperature control. Working on Goniophotometer is time consuming as compared to integrating sphere.
The LM-79 Test report generated in Goniophotometer will provides all parameters including LID. KC India Best Lm 79 testing laboratory in Delhi, Ghaziabad, Noida and all over India for more detail kindly call us at 9599880265