Brown spots, potential MG deficiency.... Your thoughts are requested!!

Doubtful on the stress.... temps have gotten as high in the summer as 93 F when on 18/6 but currently they have been at 82-85 for the past few months. I too have never heard of a "pissy mother" syndrome not to say that one does not exist. I love the idea of being able to vent those lamps. Unfortunately I have light hood that only has one vent on each: .: Sunlight Supply - horticulture and aquarium lighting systems :. Website and i would have to run some type of inline 4 inch vent hose in order to vent the reflectors directly. It's a great idea and I've been thinking of ways to vent them for years to no avail. Basically in order to vent them i'd need an input flange and an output flange therefore I could hook them up in a line. both lights run along the same 12 foot track so I'm kinda of stuck having a hotter than normal enviornment and simply venting the whole room as fast as possible. If anyone can think of a way to make to vent holes on that reflector let me know.

You would need air cooled reflectors - the kind with glass and two 6" vent flanges. I just bought four new Hydrofarm "Daystar" hoods. They're only $150 each.

PC :smokin:

Well from what I understood they only have one vent but can be air-cooled adapted. But he's right.....he'd have to drill a hole in each to connect them or cool them each with their own fans.......I don't really get where the cool intake air is supposed to come from with only one vent.

Ok i pulled the two plants in questions and repotted them into the five gallon. Funny thing was that when I pulled them they were so root bound they litterally came out of the pot with one tug. The bottom half of the buckets were literally solid white with roots. I loosened the exterior roots from the bind therefore making them more likely to spread into the new soil. One of the plant is so large that I began to bend it over laterally a trick I learned from Soma. I've slowly bent the larger one over 90 degrees and tied it to the stalk using twine. I'm with you both on cooling those hoods and I'd love to do it, I'm just not sure it's feasible given the criteria i have to work with, even if I readjusted all fans and purchased two new air cooled hoods I'm not sure I could get it to work. if I could in some way tell you in words what I'm dealing with I could. I'm a little leary about posting a picture of my setup for security reasons. I'm hoping that the repotting will help the problem and I'll be using straight water with no nutrients for the remainder of the eight weeks of flowering since the miracle grow has nutrients built in. Thanks for your help fellas if you think of anything else let me know.

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Originally Posted by twilight12

Thanks for your help fellas if you think of anything else let me know.

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Only to mention that Weedhound ain't no fella. :D

PC :smokin:

My apologies hound and thanks for the heads up PC.
I stayed up last night batting around the idea of what you suggested on being able to directly cool the reflectors in order to decrease heat. An idea I had given up on years ago simply thinking it was too difficult and not feasible. However, last night I had a breakthrough and I believe that I can setup an inline air cooled system using two super sun I reflectors wired in a line. Simply put a hydrofarm squirel cage fan (the biggest one they have) would push air from the mother room (cooler air) through a port into the mother room, it would flow through 4 inch ducting into the first reflector which would then flow through another 4 inch duct to the second reflector, it would exit the second reflector and travel through an identical hydrofarm fan (same CFM at the first one) and out the of the flower chamber. I've got most of the practical parts worked out so far the only issues I'm working on is how to support the ducting between the two reflectors since both lights are on the same 12 foot rail and both are on movers so the ducts would grow and shrink like an accordian. I think I can simply use twine or fishing line to support the middle of it without any issues. Thanks again for the brain kickstart guys and gals I appreciate all your help. If you have any more thoughts keep em coming. :thumbsup:

You don't need a fan on both ends. One fan will suffice.

PC :smokin:

I'm trying to figure out something to put in a sig or something so people won't get confused.

You want your fan to PULL air...not push it. Your fan needs to be on the side of your exhaust. A pic WOULD help but I don't want to freak you out. Have you considered a cool tube? Low on space, you can hook them together easily and if you have one GOOD inline fan it will cool them both. You'd need six inch ducting instead of four inch however.

I'm adding a pusher fan and a exhaust fan on the line since the distance is over 20 feet of ducting and i'm afraid that simply a single exhaust fan over that distance won't be enought to cool two 1000 hps bulbs. I'd rather go overkill than loose bulbs.

A very good friend of mine uses a...630 cfm inline fan I believe to cool his 2 1kw hps bulbs with six inch ducting. Says it works great for both.