Man, I think you should just wait it out. Do you have anything to measure the humidity? Light is not going to do anything. the change in temp matters and the type of mushroom. What species are you growing? Stop playing with it and be patient. It looks healthy to me, but I'm not an expert.
I care and understand. My advice would be not to rely on a grow kit provided by someone else. This hobby is not as difficult that you may lead yourself to think. It's all about what's available to you. All it takes is some grain, sterile area, a pressure cooker or oven, following directions to the T and some quality spores. There is a plethora of information here that the site provides. if you buy a grow kit, it should come with some instructions, otherwise someone basically took something and sterilized it for you and expects you to do it on your own. That is all. Use the forums that someone took the time to make to help everyone grow. You can do so much without having to make it complicated. The support is here.