yetanotherguy
New Member
...or if you're obsessive, get 4.
Is Anyone Using Phillips 315 Watt Ceramic Metal Halide?
...or if you're obsessive, get 4.
Dogwash
Well-Known Member
It's gonna be crowded at the top of the tent with four 315s in but hey if u can fit em in and keep temps down then awesome 
I've been checking out some supplementary lights today, 120w tubes, similar spectrum to the CMH but not so powerful
If i can get four of them squeezed in the corners then that's gonna lift things a little
I've been checking out some supplementary lights today, 120w tubes, similar spectrum to the CMH but not so powerful
If i can get four of them squeezed in the corners then that's gonna lift things a little
yetanotherguy
New Member
It's gonna be crowded at the top of the tent with four 315s in but hey if u can fit em in and keep temps down then awesome
I've been checking out some supplementary lights today, 120w tubes, similar spectrum to the CMH but not so powerful
If i can get four of them squeezed in the corners then that's gonna lift things a little
Agreed about the heat. I doubt that I'll make a decision until mid summer so I'll have a chance to better monitor the ambient temps around the tent during the hot part of the year and better speculate on my ability to keep temps down in the tent.
The dimensions of the reflectors (wing type) that I'm considering are .5m x .4m so I'm not too worried about fitting them in my 1.5m x 1.5m tent. They'll fit but ya, it'd be crowded. Being wing reflectors I can bend them as desired to focus the light to match the needed footprint at whatever height above canopy.
My goal with this is to never desire more light again in this tent. It was a downer to buy 4 two tube t5 fixture for perimeter lighting and have that not seem to help much. I'll just chalk it up to a lesson learned.
Grebs
Well-Known Member
At some point is it just wasting money? I mean 2 Lights in your tent would be fantastic. Do you think you'll dbl your crop by stuffing another 2 lights in it? Not saying you wont. I don't know
yetanotherguy
New Member
Well, Dogwash has 2 lights in his same size tent and he's looking to add supplementary light. So I guess the answer is that no, 2 lights with a 3'x3' footprint each don't appear to be sufficient for a 5x5 space.
I don't believe that it would double the crop, I don't think plants and lights are modular like that, but it's not really about that for me. I'm interested in maximizing the potential of the space. I know that the part of the plant directly under any given light will produce the biggest buds in any given grow space and that the branches further away will make smaller, more airy buds. This isn't so much a business for me, mostly a hobby. I like to grow SCROG so good light over the entire surface is very useful.
yetanotherguy
New Member
That said, if I go with CMH I'm sure I'll start with 2 lights for a grow. If only to keep it from dinging my wallet too hard at once.
Grebs
Well-Known Member
Good idea.. 2 will get you going good. If you up it to 4in a 5X5 area you wouldn't need anything else except fans and a good exhaust fan for temps.
BedroomFarmer
Well-Known Member
I can't imagine 1260 bare bulb watts in a 4x4 tent. Can barely get a 1k aircooled to work in my space without heat issues. Definitely wouldn't work for me. Probably end up with one 315 and some cob side lights. Thanks guys.
yetanotherguy
New Member
It's gonna be crowded at the top of the tent with four 315s in but hey if u can fit em in and keep temps down then awesome
I've been checking out some supplementary lights today, 120w tubes, similar spectrum to the CMH but not so powerful
If i can get four of them squeezed in the corners then that's gonna lift things a little
Here's a guy who's packing in 315s at what looks like similar spacing as what I would be doing with 4 in a 5x5 tent. In his words..."I'm absolutely KILLING it with these 315s".
Slowpuffer
Well-Known Member
Trust me BF !! You'll be fighting the heat all summer. You've been warned !! By someone that has the 630w. I've lost those good cold winter nights.
BedroomFarmer
Well-Known Member
Here's a guy who's packing in 315s at what looks like similar spacing as what I would be doing with 4 in a 5x5 tent. In his words..."I'm absolutely KILLING it with these 315s".
Amazing! I wonder if he uses supplemental air conditioning like from a portable a/c or window a/c?
Dogwash
Well-Known Member
I didn't even think I really needed more lights really until yetanotherguy got me thinking about putting four in there and now I can't get that idea outta me head!
Fuk
They would fit in but I'm just able to keep temps down with two so not sure how wise it wud b to do?
Maybe if I ran both extraction filter fans at the same time? Five inch they are
Fuk
They would fit in but I'm just able to keep temps down with two so not sure how wise it wud b to do?
Maybe if I ran both extraction filter fans at the same time? Five inch they are
Dr Fish
Well-Known Member
It would be the same amount of heat as 2 6oo watt hps without air cooled hoods... 75 watts a sq. ft. is a ridiculous amount of light... but it doesn't hurt to dream..
Dogwash
Well-Known Member
I've also seen some supplementary tubes i might install alongside the 2x315s
There's 120w & 60w tubes
Was thinking of getting four 120w tubes in there too
There's 120w & 60w tubes
Was thinking of getting four 120w tubes in there too
yetanotherguy
New Member
Well four 315s in a 5x5 would be 50.4 watts/sq ft but maybe you're talking about a smaller tent.
yetanotherguy
New Member
Haha, sorry man...I know how you feel though. I just finally weighed my last harvest for the first time, just out of curiosity. I got about .47 grams per watt of good bud, not counting trim or larfy stuff, with my 1140w lighting. I don't care too much about that but I was curious and I'm pretty sure 1260w of CMH would do much better without costing me much more in ventilation.
Not to make things worse for you, that one dude updated with some pics though he hasn't answered my questions yet. Obviously he's using cool hoods.
Slowpuffer
Well-Known Member
I'm saying that the one light I have, is enough to grow more than the wife & I can smoke.
Skunkworkz
New Member
A friend of mine who runs a 20000w flower room recently bought 10x of these 315w CMH lamps, and dumped them after one run due to marginal canopy penetration & lackluster performance vs. his usual Gavita DE HIDs. For the record.
Dogwash
Well-Known Member
Well that's gavita eh, aren't they ultra bright pro lamps? I'm sure they are top end but haven't ever seen em running
Yetanotherguy, whose pics are you sharing? I'd like to read that thread
I'm kinda in the maximizing space just to see how good i can make it gang, bit of a geek challenge really
Gonna pick up some supplementary tubing today i reckon
Yetanotherguy, whose pics are you sharing? I'd like to read that thread
I'm kinda in the maximizing space just to see how good i can make it gang, bit of a geek challenge really
Gonna pick up some supplementary tubing today i reckon
yetanotherguy
New Member
That guys has popped in on a thread, he doesn't seem to keep a journal, on another forum that I poke around in. Turns out he runs a sealed room with CO2 and AC to keep things cool (which would be necessary with a sealed room). He thought four 315s in a 5x5 would be overkill but for better or worse, I disagree as long as temps can be kept down.
As an alternative to four 315s I'm reading up on vertical growing but I'm sure I'll stick with the horizontal grow.
