400w MH vs 600w HPS

kiwipaulie

kiwipaulie

Well-Known Member
Hi all, at the moment i'm doing a one plant scrog in a 1mx1m tent.

Im using a 400w MH to veg and then plant to flower under 600w HPS.

I can get the 400 MH about 8-10 inch's off and the 600 HPS about 15-18 inch's

My question is, should I just ditch the 400 and veg under the 600? would it grow faster under the 600?

Cheers for your help
 
packetloss314

packetloss314

Well-Known Member
400 is plenty in that space for veg

All comments and pictures posted by the entity known as packetloss314 are completely fiction and at times outright lies. All content was copied from the internet and all statements are from the mind of a lunatic
 
packetloss314

packetloss314

Well-Known Member
600 will getcha bigger buds in flower tho....

All comments and pictures posted by the entity known as packetloss314 are completely fiction and at times outright lies. All content was copied from the internet and all statements are from the mind of a lunatic
 
G

GrowersWarehouse

Member
Bigger lights are always better....the question is are you willing to spend the money to cool the area off? If you create and oven you'll mess everything up and you'd be better off using the lower wattage light.
 
kiwipaulie

kiwipaulie

Well-Known Member
hi all, i have exhaust fans and temps are no problems, will it veg harder under a 600 further away from the cannopy or will it grow just as fast for now under the 400w mh
 
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selfmedicator462

selfmedicator462

Well-Known Member
I use the same set up and I think 400 is plenty for veg. I did run a 400HPS for flower the first few grows and can tell you that you will yield more off the 600HPS but temps do jump up. Quality bulbs make a huge difference too.
 
ddimebag

ddimebag

Active Member
HPS will make your plant stretch more...for vegging MH has a better spectrum, makes for compact, bushy plants. The red light from an HPS mimics the light of the sun in autumn (lower in the sky, more atmosphere to pass through, more blue is scattered, hence more red remains) when plants flower.
 
hbbum

hbbum

Well-Known Member
Agree with the others on keeping the 400MH for veg and use the 600 when flowering. With the size of your tent, the 600W will give you much better penetration, something that should be less of an issue while you are in veg, once the stretch kicks in, you will appreciate the extra penetration.
 
FNG Grower

FNG Grower

Well-Known Member
Agree with the others. More importantly than light intensity is spectrum. Plants in veg under HPS will stretch and will lack the blue spectrum needed to establish healthy roots and lush foliage. 400W MH veg to 600W HPS flower in a 1 meter space seems about perfect.
 
Arris

Arris

Well-Known Member
kiwipaulie said:
hi all, i have exhaust fans and temps are no problems, will it veg harder under a 600 further away from the cannopy or will it grow just as fast for now under the 400w mh
Click to expand...
You have to remember that a MH is in the blue spectrum and HPS is in the red so a HPS for veg is a bad idea. Just use the MH to veg and the HPS to flower or if you don't want to switch bulbs then buy a full spectrum bulb or dual arc.
 
L

Laerton420

Member
Im a noob. 1st grow. 400w hps veg and flower in a 3.5 × 3.5 diy tent. Ffof soil and nutes.
50 days veg 15 days into flower.

Use what ya got and carpe diem that shit.
 
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