A lamp is such a simple household thing.But everywhere there are tricks: in order for the purchase to bring you only benefit and serve for a long time, it is important to approach the choice wisely. How exactly - we will tell today Legend Articles on the topic The flow on the package is denoted as lm (lumen). For example, a standard 60 watt incandescent is about 660 lm, and 100 watt is 1,140 lm. The power of a lamp is measured in watts (W) and indicates how much electricity it consumes. The units for is the ratio of luminous flux to power, which usually averages 80-100 lm / W. Color rendering index - Ra. It shows how the light from the lamp reproduces the hues of objects in the room. The ideal value for this indicator is 100 Ra. The luminous flux angle is measured in degrees and is important for spotlights. To illuminate a specific subject, opt for a lamp with a small angle, and for an entire room, with a wide angle, approximately 120 degrees. Voltage is indicated by the letter V (volts) and indicates the level of sensitivity of the lamp to voltage surges. For LED lamps, it ranges from 100 to 240 V. The temperature of the light is measured in Kelvin (K) and shows what color the light comes from the lamp - warm or cold. The lower the value, the warmer the light will be, and the more, the colder. The approximate range is from 2,700 K to 7,500 K. 
Types of plinths The first most popular -screw base E27, 27 mm in diameter. In second place is the E14 screw base, its diameter is 14 mm. The GU 5,3 base is found both in 220V and 12V lamps, most often in halogen, soffit, or LED lamps. GU 10 base, usually found in halogen mirror or LED lamps with a voltage of 220V. The GX53 base is suitable for GX luminaires - flat and large, as well as for lighting stretch ceilings. Related Articles 
Heatsink in LED lamps Anyone has itLED lamp and is a radiator, which is necessary, because their own heat is destructive for such lamps. A high-quality radiator consists of an alloy of aluminum, silver and copper and has fins for a new heat sink - this is a guarantee that the lamp will last a long time. Unfortunately, the higher the quality of the lamp, the larger the radiator and itself, therefore, when choosing a lamp according to the principle of "small but inconspicuous", be prepared for the fact that it will not serve you for long. 
Ripple in LED lamps If on the packageit is written that the ripple coefficient is 0%, which is very good: in high-quality LED lamps, the ripple should be minimal. The fact is that it can adversely affect vision, cause fatigue, headaches, and generally negatively affect health. It is difficult to notice the ripple with the naked eye, so be sure to check this indicator before buying. There is also a simple, "popular" way to assess the pulsation - to point a smartphone camera at it. You will see moving stripes - in front of you is a cheap and low-quality lamp. Related Articles 
How to choose a lamp: important information and tips
