The SLPRO8 module is a new kind of composite back shell with outstanding features like high intensity, low cost and excellent heat dissipation (with Patent No. ZL 2013 2 03659863, ZL 2013 2 03659685). The module structure is simple but three-dimensional. Both sides of the bottom shell are equipped with upward reinforcing ribs, which make up the regular hexagons in succession. On the premise of not conflicting the shell and the electric components on the LED module, both the intensity and stiffness of this structure is high, meanwhile it can also make full use of material and better match different LED modules.