nomofatum
Well-Known Member
Sure you can, depends on what you want the plants to look like. HPS (warm/red end spectrum, 2200-3500k) will make taller thinner plants where MH (cool/blue end spectrum, 5500-7000k) will make shorter denser bushes.
Is a 400 watt light too much for a 48x24x60 tent?
- Thread starter VACAVILLE,CA.GROWER
- Start date
indicat33
Well-Known Member
http://www.amazon.com/Metal-Halide-Aquarium-20000K-Mogul/dp/B009HC7O56/ref=sr_1_7?ie=UTF8&qid=1425334343&sr=8-7&keywords=400w+BLUE+aquarium+bulbthanks for your message, the only reason i am using a 400w is because it comes with my complete grow kit, could you provide a link of what one of these MH lamps look like? i may give it a go later on
Rich_Porter1
Member
thanks for the responses guys, i will buy a 600w HPS light for veg and 400w MH for the flowering. if you can provide a link for a correct UVB light would be fab! i will also be using autoflower seeds
VACAVILLE,CA.GROWER
Well-Known Member
so vegging with that bulb would be better than a regular mh bulb or do you flower with it?
indicat33
Well-Known Member
Not sure about a UVB light source, but you could Carefully shop for a 600-watt MH bulb which Contains UVA-UVB- (and possibly even C). Just make sure your ballast is switchable. Look in the aquarium and reptile sections to find the bulb.thanks for the responses guys, i will buy a 600w HPS light for veg and 400w MH for the flowering. if you can provide a link for a correct UVB light would be fab! i will also be using autoflower seeds
nomofatum
Well-Known Member
indicat33
Well-Known Member
VACAVILLE,CA.GROWER
Well-Known Member
I seen you showed a 400 watt blue bulb. Would that be used in veg or flower?
nomofatum
Well-Known Member
I give up on making it show up right, something goofy with getting that pic to show up. Doesn't seem to hit UVB, but hits lots of good blues.
indicat33
Well-Known Member
I would personally use it form seed to harvest. Veg growth will be LUSH and Perfect. The intense blue-violet rays will have a favorable effect on terpenes/cannabinoids in the end. Some smart growers ONLY use this method. They report: short, squat growth, tight buds, and increased resin (probably due to the intense blues/violets). Peace-
VACAVILLE,CA.GROWER
Well-Known Member
would it be a good idea to use the bulb from seed to harvest in a scrog grow?
Rich_Porter1
Member
stuck whether i should go for the MH from seed to harvest or go for HPS on veg and switch to MH during flower period
nomofatum
Well-Known Member
UVB bulb depends on your fixture, they are all florescent options:thanks for the responses guys, i will buy a 600w HPS light for veg and 400w MH for the flowering. if you can provide a link for a correct UVB light would be fab! i will also be using autoflower seeds
CFL: UVB 10.0 Reptile bulbs (Zoomed or Exo-Terra) are known brands, beware they also make 5.0 or 5% versions.
T8: Same options as CFL
T5: Same options or Arcadia UVB bulbs
Tanning Bulbs (10% UVB version is usually the highest)
Edit: added a few hidden links in there. Note I did not price shop.
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indicat33
Well-Known Member
I believe it would be. This spectrum gives the plants everything they need to produce AMAZING grass. Why not use it as often as possible? Do it, and you'll see what I mean.
VACAVILLE,CA.GROWER
Well-Known Member
In a scrog grow would it be better to start vegging with mh bulb then switch to the 20000k blue bulb for flowering. Or just see what happens from start to finish. Thank you for your time and replies.I believe it would be. This spectrum gives the plants everything they need to produce AMAZING grass. Why not use it as often as possible? Do it, and you'll see what I mean.
Rich_Porter1
Member
excellent thanks very much, have checked link will have a look if its around where i am in as i am not in the U.S
nomofatum
Well-Known Member
Only problem is they also report significantly lower yields. Better to use more reds, but still a fair deal of blues + UVB in flower. Reds seem to drive up quantity while blues and UVB drive up quality. Though I think the result of a full spectrum will have the best quality.
This is also why I run 4 different light types:
1. CMH 3100k
2. LEDs 3000k
3. LEDs 6500k
4. Tanning Bulbs 10% UVB, 30% UVA, 50% blues, 10% other
Everything is covered with the weakest part of the spectrum being the greens that are reflected more than other colors, but there is still some, nothing is missing.
indicat33
Well-Known Member
MANY years ago, (in the early 1990's) I was hard-up for a cheap lamp I could grow a little crop with. I read Hight Times then, and saw an article called : "Bring the Mountains Indoors" , about employing Mercury Vapor (clear bulb)- (not phosphor coated), in the grow-room. I bought a 175w MV Lamp at Lowes and mounted it horizontally (aluminum foil reflector)- It worked. The plants grew short, squat, and "zig-zagged" through the internodes. Plants were BLUE, forget about green . Grew some smoke from seeds, using only this one Lamp. Buds were tight, and absolutely Covered in trichomes. I remember the smoke was "above average" in potency. The strain was just some decent bagseed. Anyway, my conclusion = These "unconventional lamps" are definitely worth a second glance. 
. Grew some smoke from seeds, using only this one Lamp. Buds were tight, and absolutely Covered in trichomes. I remember the smoke was "above average" in potency. The strain was just some decent bagseed. Anyway, my conclusion = These "unconventional lamps" are definitely worth a second glance.
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nomofatum
Well-Known Member
That bulb you describe was kicking out a bunch of UVB and likely even UVC. Would give some interesting results, just be careful about exposing yourself, especially to UVC, but even to UVB.MANY years ago, (in the early 1990's) I was hard-up for a cheap lamp I could grow a little crop with. I read Hight Times then, and saw an article called : "Bring the Mountains Indoors" , about employing Mercury Vapor (clear bulb)- no phosphor coated in the grow-room. I bought a 175w MV Lamp at Lowes and mounted it horizontally (aluminum foil reflector)- It worked. The plants grew short, squat, and "zig-zagged" through the internodes. Plants were BLUE, forget about green
VACAVILLE,CA.GROWER
Well-Known Member
so I could veg with 20000k blue bulb. Then flower with the hps. Then maybe the last 2 or 3 weeks finish with 20000k blue bulb? Would that work or just be a waste of time.