LED是单向导电的发光体，如果有反向电流，则称为漏电，漏电电流大的济南发光字，寿命短，价格低。
LED is a single direction of the light-emitting body, if there is a reverse current, then known as the leakage, the leakage current of Ji 'nan light emitting, short life, low price.
济南发光字的发光体为晶片，不同的晶片，价格差异很大。
Ji 'nan luminous character of the light-emitting body for the chip, different chip, the price difference is very big.
济南发光字的发光体为晶片，不同的晶片，价格差异很大。
Ji 'nan luminous characters of different brightness, the price difference.
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