Structural and fixing parts that can prevent lamp body from damage, small power legerity, high effective distribution of light beam.

防损坏灯体结构和固定件，小功率、轻巧，高效光束分布。

youdao

Damage tends to be concentrated in a few structural members at the early stage, so the stiffness perturbation matrix tend to be in small rank.

在结构损伤的早期阶段，损伤往往集中发生在少数单元，损伤前后总体刚度矩阵差的秩较小。

youdao