How close can i have my 600w cooltube?first indoor time,already started

hi guys,so i have 4 auto ak,1 roadrunner auto,and 3 easyryder auto in a 120x120x200cm tent(Dark Room)

my thermo/hygro meter on the floor of the tent,says temp is usually 75-78 inside the tent,i have the 600w about,hmm say,100cm from the plants,is this too high???i will double check these numbers,i will be measuring,actually ive just gone and checked,my light is 1m from seedling top,i cannot get it any lower than this with the ducting i have.will this be stretching them too much?i can get pics of all this(i mean,the pic i saw of my tent actually set up had the cootuve right at the top,but maybe that didnt mean shit,was in the booklet for set up)

i also have another problem,i think theres a slight air leak on the cooltube to carbon filter side,its making the ducting vibrate slighty,and this is causing slight vibration in the bulb,ever so slight,but im guessing its not good,im trying to fix it right now with good old duct tape(ive used tape for all my air fittings)

big up to all RIU members,you are all awesome

well,ive tried,and i cant stop the venting/ducting from giving this vibration,its really pissing me off now,i swear i can hear a very small air leak on the cooltube to filter side like i said,and im sure its causing a pressure difference and making the venting vibrate a bit,thus making the bulb wobble slightly,i dont think it will really matter will it?

would be amazing if someone could help me out,my previous grow which was my first before this,was stolen,hence im doing this.

you can have the light way closer to plants if you a yoyo system (i hang on chains......work just as good.....) my 1000W is a meter away from my plants, without a cool tube...... just put your hand overtop of your plants and see if you can feel the heat, if you can its to low. lower t untill you can feel the heat then back it off 1/2 a foot.

you should find where the leak is and duct tape it.....that IS what its for, other than early aircraft...... just run your hand along the piping and you should be able to feel where the air leaks, and tape it.

mine vibrates aswell, if you stand in the living room and listen quietly you can hear it, so i have a radio going all the time, this masks the sound.

flex ducting cures alot of vibration issues. foam insulation cures the rest.

if you can't move light can you raise your plants? 30-45cm would be better

nice set up

thanks guys,so about 50cm from the plant tops is ok?

they look a little ill now,1 or 2 has slightly drooply leaves and weird coloring,like the same color as the veins in the leaves,are starting to appear on the leaves,they were sprouted outside for a week or so,are they just adjusting to the harshnes of the new light source???i really really dont want this to fail,itd send me mad

ive got the cootuble on easy rollers,but they wont go down far enough because of the ducting,and when it does go down far,it becomes not straight,tipped over kind of,so its spun on its axis slightly(horizontally) because of the pull of the ducting,i realise i should have used more now but,hey,tis done.

i think ill have to get something to put under the pots,but i have no idea what to put under them lol

min and max humidity were 30 and 65 percent respectively,weird fluctuation i want it pretty constant dont i??

thankyou for all your input its GREATLY appreciated

ive just added a circulating fan in the tent,9 inch i thinks,i know i should have had one already,but i had to go first few days without it,this is big problemo?