LED Spot lights can be divided into these types according to the size of smooth PAR16, PAR20, PAR30, and PAR38. It commonly used lamp with GU10, E27, E14, etc., these spotlights are based on 85 ~ 265VAC. In addition there is another MR16 spotlights, the lamp is GU5.3, which used 12VAC power supply. Its front end has an electronic transformer or frequency transformer to convert the mains 22OVAC to 12VAC.
LED Spot lights angle is generally 65 ° or less, mainly for local lighting, accent lighting and other occasions. The manufacturers are mostly concentrated in the angle of 12 °, 24 °, 36 ° ranges.
According to “GB 50034-2004 architectural lighting design standards”, the correlated color temperature of indoor lighting can be divided into three groups, less than 3300K is warm, which is suitable for room, bedroom, wards, bars, restaurants; 3300K ~ 5300K is intermediate color, which is suitable for offices, classrooms, reading room, clinic, laboratory, machine shop, instrument assembly; the color which is greater than 5300K is cool, that is suitable for hot processing plant, high illumination spaces [1]. Current international and domestic standards is basically a reference “ANSI C78.377”, will be divided into color temperature 2700K, 3000K, 3500K, 4000K, 4500K, 5000K, 5700K, 6500K these several grades, the color temperature is allowed the color tolerance range.
Therefore LED spotlight usually divided like these classification. However, LED spotlight is mainly used in indoor lighting; So the color temperature are mainly focused in 2700K, 3000K, 4000K and 5700K.
In the “GB 50034-2004 architectural lighting design standards” stipulate that long-term work or stay rooms or spaces, the lighting color rendering index (Ra) cannot be less than 80. In Luminaries mounting height greater than 6m in industrial construction sites, the Ra may be less than 80, but must be able to identify safety colors [1].
When you purchase the LED spotlights, you need to carefully read the manufacturer’s instructions or packaging, and determine the product’s supply voltage as well as product-related parameters, including the luminous flux, color temperature, power, color rendering index, angle and so on. Indoor lighting, when you buy the LED spotlights, we must first determine whether it use electricity supply directly, or using transformer power supply, in order to select the purchase or other MR16 spotlights; secondly to determine cap and spotlights Demits size; then need to confirm your desired angle range of spotlights; finally based on the “GB 50034-2004 architectural lighting design standards”, and at end to confirm the color temperature, color rendering index according to applications in order to achieve the desired lighting effects. If the argument is not very good for lighting the case, you can view the equivalent label on the package to see how much power is equivalent to traditional lamps.
Because of existing manufacturers of LED lighting varies greatly, many manufacturers is not strictly referring to IEC 60630 design spotlights shape in order to solve the heat problem of space and power supply placement; while spotlights in some cases as some of the lamps light use, so need to be clear that the LED spotlight can mount the fixture. If you cannot load, you still need to buy the matching lamp housing, to replace the overall style. For MR16 spotlights, due to its front end, it has a frequency transformer electronic transformer. So when you buy MR16, you also need to verify compatibility with the transformer. If it will be incompatible, the lights will appear flashing situation. For SCR dimming lights, it also need to consider lamps and dimmer compatibility issues, otherwise there would be dimming lights flashing or not dimming phenomenon.