The YOWHICK projector appears to have decent brightness, with a claimed output of 6500 lumens, which should be sufficient for use with ambient light in a dimly lit room. However, it's important to note that the actual brightness and image quality will also depend on the screen size and surface, distance from the projector, and ambient lighting conditions. Additionally, the product description does not provide any information on the type or quality of the projector's light source, which may also affect its performance with lights on.