Using a UV light in combination with an IR light can have some benefits for growing marijuana, such as boosting secondary metabolite production and regulating the flowering cycle. However, these types of light should be used carefully and sparingly, as they can also cause harm to the plant if used excessively or improperly. It is advisable to use infrared and UV in conjunction with other types of light, to create a balanced spectrum that meets the needs of cannabis plants at different stages of growth.