Jef79answered grow question 4 years ago Hello.. Hope you are well.. I see u have 2x 600w hps with propa cooling systems.. Nice choice.. Ok to regulate ur lamps.. 1 digital timer for each lamp in different sockets will let u b able to set day/nite cycle.. Ur exhaust system i wud honestly leave on constantly.. It will let ur plants get an unlimited room full of fresh, clean air(reduce ur chance of bud rot).. Again most big big fans will run smoothly and safely on just 1 digital timer.. Just b sure not to plug everything into 1 extension.. I personally use 3 plug sockets with extension in each with just 1 light on each n maybe 12v-9v pumps etc.. All fans go into 1 extension n leave on except about 4 oscillating fans which again go on digi timers.. U dont need super expensive ones.. Aslong as they 13amp ur safe.. Stay safe n gud luck.. 👍🍀