The choice of a LED product is guided by watching specifications tables. Here is one table accompanied by the explanation of the features. The result should be a good lighting solution that is leaving a green ecological footprint. A good lighting solution is emitting enough light that the tasks in space can be conducted properly. First the lumens of the fixture (responsible for brightness in the room), the CRI (how good is the lighting concept representing colors), color temperature (how is the ambience in the room) and lumen per watt (efficiency of the system) are recommended to be watched. These criteria are responsible for a good lighting quality and energy efficient solution.
The other features are necessary information too. They serve further details about the fixture, the setup and maintenance of the lighting system.
(1) Type: The products name is a detail for purchasing the fixture
(2) Wattage: Defines the energy consumption of the fixture, which is important for the electrician and the ecological footprint of the system (referring to Lumens per Watts)
(3) CRI: Important character in areas where colors should be truly represented. For applications where people are involved, a CRI lower than 70 is not recommended. In shopping areas a CRI of 90 and higher is applicable.
(4) Lumens: responsible for the brightness in a room. The more lumens, the brighter the fixture is illuminating the space.
(5) Lumen per Watt: Efficiency of the lighting system. The higher the lm/W the better the ecological footprint of the product.
(6) Lumen Maintenance: how fast LEDs lose their brightness compared to new products (most manufacturers refer to the time when most of the LEDs reach 70% and less of the initial lumen output)
(7) Color Temperature: defines the mood or ambience in a room. Low quality lighting fixtures mostly have a very cool color temperature as these LEDs are more efficient than warm white LED products. A color temperature higher than 6000K is not recommended for a lot of areas.
(8) Beam Angle: the light is radiated into the indicated beam angle. LEDs are direct light sources with typical beam angles of 120° till 180°.
(9) Life Hours: defines the lifetime of a LED product. LEDs last 50,000h up to 100,000h.
(10) Replaces: a helpful information for replacing conventional light sources
(11) Working Voltage: high quality LED products have an integrated driver, Retrofit Solutions are delivered with the suitable ballast already.
(12) Frequency: detail about the admitted voltage frequency
(13) Power Factor: Efficiency of the ballast
(14) THD: Total harmonic distortion is describing the distortion caused by ballasts and other inductive loads of the input current on alternating current (AC) power systems
(15) Operating Temperature: The light source is operating under the mentioned conditions according to the manufacturer datasheet, other temperatures will cause the light source to fail or work not properly (e.g. light loss, different color temperature)
(16) IP Rating: the protection of the light source, ballast and wiring against liquids and solid objects
(17) Dimmable: dimming is the change in light source brightness, mostly undertaken by smart controls
(18) Dimensions: the fixture’s size, important for the definition of the mounting position and space
(19) Net Weight: the fixture’s weight, important for the mounting construction, e.g.ceiling strongness needs to be considered
(20) Housing: the housing is the surrounding of the light source and ballast, the higher the IP rating, the better the protection against liquids and solid objects which is important in car washes for example, the coating is important in swimming halls where the luminaires are exposed to chloride and humid conditions
(21) Mounting: possible mounting ways like pendant, surface or hock mount
(22) Warranty: how long after purchasing, the products are ensured working properly
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