The most appropriate number of LED lights color temperature
People say, high color temperature LED has luminous efficiency, energy-saving effect, but is uncomfortable, has easy visual fatigue and is poor through the fog; low color temperature, although feel comfortable, but low luminous efficiency, energy saving is also less effective; so, in practical applications, in the end what kind of color temperature of light is able to combine efficiency, energy efficiency and comfort requirements?
Sales staff from BYD lighting, said the color temperature of lights for both the main road and the branch, he believes that a low color temperature lights feels natural, familiar, but the lumen is not as good as the same wattage high color temperature. High color temperature can improve pedestrian focus on the degree, but also cause the driver visual fatigue, so the lighting effect requires an integrated multiple indicators. "Therefore, we recommend the main road 3500K ~ 4000K, branch 2700K ~ 3000K. But for the color temperature, it is impossible to take into account the variety of needs. If I have to choose one color temperature of both aspects, I think it is reasonable 3000K. "
The technical staff, from Shanxi Province agreed that, there is no big difference for the light effect of the LED light source, whose color temperature is greater than 3500K. the light effect of the LED light source, whose color temperature is below 3000K, can be reduced by about 10%, 4000K is the most appropriate that can be take into account to meet the variety of needs, and it’s more energy saving and effective. We recommend the use of LED lights color temperature not exceeds 4000K!
Philips Lighting technician also said that, from the point of the current LED chip technology, the efficiency gap between high and low color temperature light LED chip, is approaching, the color temperature from 3000K to 4000K fundamental can reconcile the various needs, you can achieve a higher efficiency, but can also make people feel comfortable.
ENELTEC company's technical staff said that, if in terms of the illumination and the comfort zone color temperature, different illuminance require different color temperature, such as it’s more comfortable for street lamps with about 3000K, tunnel lights can consider about 3000K ~ 4000K, indoor generally about 4000K ~ 5000K; but overall , it’s low efficiency within 3000K, currently it is recommended using about 4000K color temperature for road lights.
In theory, the average color temperature of the sun is about 5600K, giving people the feeling of a cold tone if the color temperature is higher than that; the color temperature of the sun at seven or eight o'clock in the morning is about 4000K, at two three o'clock in the afternoon is about near 5000K, during this time human activity is the most active, so select 4000K or 5000K is suitable for human activities.
Experts said that, although the temperature of the midday sun is close to the true nature around 5600K, but the human in general, select selection lunch break at this time, the working efficiency is low, therefore the color temperature of about 5700K is not preferred. Meanwhile, according to driver stress test of time from the Virginia Institute of Technology , at 5000K color temperature, the driver take action shortest time. From the packaging point of view, at 5000K the proportion of yellow light and blue light is suitable, light-efficient; when the color temperature of 3000K or less, the luminous efficiency decreases, the human stress response time increased, the alertness decreased, so this is a misunderstanding, merely to meet some people’s needs. Data show that, 4000K and 5000K also accounted for a large proportion of the order, which reflects actual customer application needs. 5000K color temperature is the best for street, if taking into account usage, 4000K color temperature is acceptable.