The Self-Ballasted Compact Fluorescent Lamp of an "A60" Bulb Shape.

Abstract

Self-ballasted compact fluorescent lamps (CFLs) have been developed and improved in these twenty years. In Japan, the CFLS that have diffusive glass globes to replace incandescent lamps have been developed, but their sizes were too large to fit in the luminares of incandescent bulbs. Thus, we have developed the self-ballasted CFL of an "A60" bulb shape, which has the maximum diameter of c60 mm and the length of 123 mm. This lamp could be substituted for a 60 W incandescent lamp. In order to realize this lamp size, we opt.imized the discharge tube diameter, filling gas type and pressvre, the shape and makmg process of the dlscharge tube After all the tnple "U" connected tube Is selected, which has a decisive advantage against a multi-folded tube on the luminous maintenance during life, but also has a disadvantage on the luminous run-up characteristics. We investigated the behaviors of mercury, especially the mercury diffusion phenomenon released from the auxiliary amalgam-Wags after ignition by both experiments and calculation. The luminous run-up characteristic has been much improved.

Optical, thermal and run-up performance of reflector compact fluorescent lamp

“…The excessive heat built-up may cause damage to the printed circuit board (PCB) and, thereby, unstable operation of the lamp. [6][7][8][9][10] Usually, the run-up performance is poor for cover/ reflector lamps due to the amalgam used. When the lamp is switched off, mercury is absorbed by the amalgam.…”