1. Ta within –5°C of Ts, in accordance with LM80.这一段是什么意思?我知道是参考LM-80标准,但是我不明白-5℃的条件是怎么一回事? 2.Interpolated Lumen Maintenance to 6000hours using Fixture Performance Interpolated Lumen Maintenance to 6000hours using component Performance 这两个项目是什么意思?测试什么的?