does sunlight influence business effectiveness

[myfs_92575]

For a long time I've been experiencing a slow period in my business life. I'm responsible for sales and almost all proposals I sent are rejected. Previously, the things are not like that. I arranged my sitting according to my gua (my gua number is 4 and I sit facing between south-southeast). My room takes only sunlight from a balcony door which is positioned between building walls. So it is always dark. I use electricity for the light. I really would appreciate if you inform me about the effects of sunlight (is it necessary or not) and can you inform about other cures for icreasing the sales.. Thank you very much in advance.
ML