High luminous-efficacy industrial lighting device

A high luminous-efficacy industrial lighting device, comprising at least one lighting module, wherein the lighting module comprises:

• a base;
• a light source board disposed on the base;
• and
• a lens disposed on the base and covering the light source board, wherein the lens comprises an optical module comprising a central portion and two side portions respectively disposed on two sides of the central portion, whereby an accommodation space is formed between the central portion and the side portions, and the light source board is disposed within the accommodation space and faces the central portion;
• wherein each of the side portions comprises a light entrance surface, a reflection surface, and a light exit surface, whereby a light emitted from the light source board passes through the light entrance surface, is then reflected by the reflection surface, and exits through the light exit surface, wherein each of the side portions further comprises a first connecting surface, a second connecting surface, and a third connecting surface, wherein the first connecting surface is disposed between the light entrance surface and the reflection surface, and contacts the base, wherein the second connecting surface is disposed between the light entrance surface and the light exit surface, and connected to the central portion, wherein the third connecting surface is disposed between the reflection surface and the light exit surface.