Need Help on lowering humidity For Flowering

ok another newb question again. So im 4 weeks from seed and 1 week into veg state with nutes. my humidity is fine for veg state. lights off 50-60 % lights on 30-40%. So since I am going to be going entering the flowering stage in a few weeks I was wondering is there any way to drop the humidity in my grow box because I have read that above 50% is asking for bud rot. When my lights are on the rh is fine can go as low as 34% and no more than 40 % but when the lights go off and I check the memory of my rh meter it reads a recorded high of 50-60% one time I even seen it at 70%. I have left my fan running now 24/7 even when lights are off (18/6 schedule for lighting) and it doesnt seem to go above 55%. plz help me out

here are my specs
3'w x 3'l x 4'h

640 actual watts cfl lighting for flower
550 actual watts cfl lighting for veg.

10 plants ...so far ...not signs of sex yet

Thanks in advance

Whats your homes RH?

do you have a strong exhaust? what the cfm?

also, a dehumidifier helps slightly

If you think you have a problem with high humidity, buy a dehumidifier.

I have de humidifier actually . But not using it. I thought that since I am only growing in a box that putting it on the room the box is in wouldn't really do much since I have the door open to control temps

Not sure on humidity in house either

Just to clarify. The door stays open for the room the box is in not the actually door for the box

My exhaust is 325 cfm with passive intake

illa101k2 said:

My exhaust is 325 cfm with passive intake

Click to expand...

try 440 cfm. Thats what i have and it helps. Also, if absolutely necessary you can open the grow room door while the light are on. That will bring it down a little unless your room humidity is high

thatreedocta said:

try 440 cfm. Thats what i have and it helps. Also, if absolutely necessary you can open the grow room door while the light are on. That will bring it down a little unless your room humidity is high

Click to expand...

I can't really add another fan now a I would have to cut my box and fit it in. would me leaving the box door open during the lights off cycle reduce humidity at night? The room is completely dark so I'm not worried about the light and the smell I don't worry about . Ona seems to works for the space I have. If using dehumidifier should I set it at desires humidity level or lower since I wanna lower my current humidity

Ya..open it up as long as no light. Run the dehumidifer in the room if you want.
edit: and vent the exhuast outside if you can.