1: the comparison of the lighting area, the lighting area is good (thick pipe, tube length)2: lighting efficiency (light and heat conversion efficiency), you can ask the manufacturers, vacuum tube absorption and emission ratio, the general absorption ratio of 0.95, less than the reflection ratio of less than 0.05!
3: material - good tube glass is high borosilicate glass, glass performance is good! Also asked about the wall thickness, 1.6mm or more!4: coating process - a direct impact on the useful life, good can be used for more than a decade! Inner wall coating of glass tube5: outer tube - nozzle and tail tip is smooth, no bumps, no obvious scratches, cracks, etc.!
First of all, as consumers, can be judged from the influence and credibility of the manufacturers, big brands, there are patented technology, the general quality control is better!
