That year summer

Luminous efficiency:

Commonly referred to as the components of the external quantum efficiency, the components of the internal quantum efficiency and the extraction efficiency of product assembly. The components of the internal quantum efficiency, is actually the component itself electro-optical conversion efficiency,dab4d53ck mainly with the component itself characteristics (such as a component material band, defects, impurities), components of the barrier grain composition and structure and so on. The components of the extraction efficiency is the component of internally generated photon, after the component itself, refraction, reflection absorption, can be measured in a component external to the actual number of photons.

Therefore, on the extraction efficiency of factors including the component material itself, the absorption component geometry structure, assembly and packaging materials of the refractive index difference and the component structure of the scattering characteristic.overseastudyhk.com/ The components of the internal quantum efficiency and the components of the extraction efficiency of product, are the components of the luminous effect, also is the component of the external quantum efficiency. Early component development is focused on improving its internal quantum efficiency, mainly by the way of raising the base crystal quality and change the base crystal structure, so that the electric energy is not easy to be transformed into heat energy, thereby indirectly improve the luminous efficiency of LED,ipazzport thereby obtaining the theory about 70% internal quantum efficiency, but this is the internal quantum efficiency is almost close to the theoretical limit. Under such condition, light relies on to improve component internal quantum efficiency are unlikely to improve components of the total amount, so improving component extraction efficiency has become an important research subject. The present method is: grain shape change -- TIP structure, surface roughening techniques.

Classification:

According to the LED daylight lamp diameter: T5, T8, T10category, T12

According to the LED daylight lamp mask classification: diffusion cover and a transparent cover ( striped transparent cover )

According to the LED daylight lamp control function classification: conventional LED fluorescent lamp, fluorescent lamp, infrared control voice LED Floodlight, intelligent LED daylight lamp

Electrical characteristics:

Current control type device, load characteristics similar to PN junction UI curve, turn-on voltage of minimal change will cause the forward current of great change ( index level), reverse leakage current is very small, there is a reverse breakdown voltage. In actual use, should choose. Forward voltage of LED decreases with increasing temperature and smaller, has a negative temperature coefficient. LED power consumption, one part into light, this is what we need. The rest is converted to heat, causing the junction temperature to rise. Heat ( power ) can be expressed as.