求翻译：如较多使用的国产SILAN管，其价格便宜，但亮度低，光衰大，有效寿命（光衰达到50%时的时间）短，通常工作较长时间后亮度就会明显下降，耗电量大，同批管亮度一致性差，可视角度略小，在不长的时间内（如三个月）颜色会有变化，由于有很多的国内封装厂家，所以价格质量相差很多。是什么意思？

Such as greater use of domestic silan tube, its cheap, low brightness, the light fades, the effective life (the time when the light fades to 50%) is short, usually work a long time after the brightness will be decreased, power consumption the same batch of tube brightness consistency and slightly sm

As a multi-use SILAN tube, and the GNP at low prices, but its low brightness, and optical loss, effective life (the loss is 50 percent of the time, usually after a long period of time the brightness will be significantly lower power consumption, and the same consistency of the brightness difference

If the many use domestically produced SILAN tube, its price is cheap, but brightness is low, the light fades in a big way, the effective life (light fades achieved 50% when the time) short, after the usual work long time brightness can drop obviously, the power consumption is big, with approves the

As more using of domestic SILAN tube, its price cheap, but brightness low, light failure large, effective life (light failure reached 50% Shi of time) short, usually work more long time Hou brightness on will obvious declined, power consumption large, with batch tube brightness consistency poor, Vis

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