灯管光衰小，延长灯管寿命。
灯管光衰小，两端电极装有内保护环。有效减少电极溅射，减少黑头，延长灯管寿命。
Light bulbs, containing both electrodes decline in protecting ring. Effectively reducing electrode sputtering, reduce blackheads, prolong lamp life.
用本发明方法涂粉后的灯管，发光效率高、光衰小、使用寿命长。
The lamp tube after using the method for coating the powder has the advantages of high luminescence efficiency, small light wane and long service life.
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