im planning on buying a secret jardin dr40 and using it for veg and flower at the moment. its dimensions are 16''x16''x47'' and i will be using a 150w hps for lighting. my question is that with this amount of height how long should i let the plants veg for to get the maximum yield but still have enough room? Also, since the plants will be kinda short should i just wait until flowering to start the nutes or should i start nutes in veg?