LEDs. Problems of modern LEDs. Scheme, description

ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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LEDs. Problems of modern LEDs. Encyclopedia of radio electronics and electrical engineering

Free technical library

Encyclopedia of radio electronics and electrical engineering / LEDs

The main problems, hindering the mass introduction of these most promising light sources, today are:

problem 1 - the high price of light energy produced by light emitting diodes (LEDs);
problem 2 - heat dissipation.

As already mentioned, the price of SD is declining quite rapidly. But in terms of lumen-hours, LEDs are still an order of magnitude inferior to traditional light sources. Thus, the cost of one klm/h, produced by the cheapest Chinese white LEDs with a service life of 50 h and a luminous efficacy of 30 lm/W, is about 20 kopecks; service 35 thousand hours - less than 16 kopecks.

According to a special supplement to the German magazine "Licht-Special", the cost of one klm / h, generated by powerful LEDs, is from 1,33 to 2,78, and generated by a 10 W CFL - 0,07 euro cents.

Let's hope that this problem will be successfully solved over time. Concerning heat sink, then this problem did not arise earlier simply because more than 90% of all LEDs produced in the world were 0,01-0,08 watts. It appeared with the advent of LEDs with a power of 1 watt or more. Now powerful LEDs from leading companies are made of a flange design, similar to powerful transistors, and require the use of additional external radiators, produced in sufficient quantities.

Author: Koryakin-Chernyak S.L.

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