ok well 550 cfm is a lot I runn like a 1/5 of that .. I know Im low on ventilation .. why I runn it at night and use a air intake from out side to keep the temps under controle ..will buy a bigger vent. next month .. but after 15 inches it just feel way to hot for my hands .. I dont belive air flow woud fix that ..
also most places I read about lighting .. HPS and distance .. tells me to keep it 18" inches away for optimal light .. dunno ?
but we are kind a off topic here
I now know why my bottom leaves and under grow is turning yellow .. to crovded and nearly no light comming down ther ..
but what about my leave tip burns ?
anybody abe to help me out here ?
when I read them guides about pant problems they tell me it could be one of either thing .. to much water .. to littel water .. to much nutriense .. or missing sumthing .. or light burn or heat .. or wind or or or or or ... arrrr !!! its not like it help me much .. I know it can be many things .. but I need somebody with some grow experiance who maybe have some experiance on this and know what can be done to find out what it is and to fix it in the end or atlest know how to deal with it on my next grow ..
Ooh yea and thanks a lot for all the input so fare ..