LED street light-the relationship of TJ.and life time

So long ago ,we always devoted to development our LED streetlight with long life and low junction temperature .Why we do that ,pls see below :the relationship of the junction temperature and life time :

T(℃) LIFE(HOURS)
25 -------234.000
30---191.000
35---157.000
40---129.000
45---107.000
50---90.000
55---75.000
60---64.000
65---54.000
70---46.000
75---39.000
80---34.000
85---29.500
90---25.700
95---22.300
100--19.500
105--17.100
110--15.100
115--13.300
120--11.700
125--10.500