joejoe4444
Well-Known Member
im trying to make a choice on using a, MH 400w bulb , or a 600w HPS for growth stage whats going to be better ? thanks
400w or 600w ?
- Thread starter joejoe4444
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astronautrob
Well-Known Member
MH is best for veg, I'm guessing that's what you meant by growth stage.
joejoe4444
Well-Known Member
yes im about 5weeks from seed, just repoted them 2 days ago still in recovery , ty
astronautrob
Well-Known Member
Np dude, that's what I veg with and then I'm gonna throw a 1000w HPS to finish them off.
joejoe4444
Well-Known Member
ah thats cool do u have a cool tube aswell ? how far from the tops do u have it roughly ? ty
astronautrob
Well-Known Member
Yup have the cool tube too, love that thing. If I'm running the 400w MH I usually try to keep it roughly around 12-14 inches above the canopy.
tropicalcannabispatient
Well-Known Member
Like astronaut say mh is better for veg, but IMO i prefer to do 18 inches away from tops. GL
joejoe4444
Well-Known Member
FYI i read this today , you may already know about it , ( Cool-tubes are a great product which, for very small grow rooms or rooms running lots of lights, can be the only option for running high-intensity discharge (HID) lighting. However, they do have their downsides. Compared to an 'open' reflector, the curved glass in a cool-tube reduces the amount of available light that reaches the plant. Also, glass will block out the UV light that reaches the plant and it is UV that causes Cannabis to create and release her lovely essential oils. )
astronautrob
Well-Known Member
Is there any particular reason why? My light height is mostly an arbitrary number (I looked at a chart one time and for some reason 12 inches stuck with me), just wondering if there something I could be doing better...
astronautrob
Well-Known Member
Yea I've heard that too, that's why it's important to keep them clean so you can negate that problem a little bit (or so I've heard, seems logical enough).
tropicalcannabispatient
Well-Known Member
Not, not really is just personal preference, i just i fell like thats the optimal light distance, at least for me, but since u have cool tube that might b better for u, i run ma 600wt without cool tube that's why i keep it at 18 inch. toke on =====~~
joejoe4444
Well-Known Member
Thank you all i will be installing a 400w MH in the next 48hours
Madagascar
Well-Known Member
Just bought a 600 w they say 600 is the best bang for your buck. But let me know how it turns out 400 a lot of light also
SPLFreak808
Well-Known Member
600 in a 3x3/3x4 will work for you. Mh or hps will both work fine for veg. If you have heavy or straight sativa's you might want to veg with mh. If you need some stretch for a certain method, hps will do that for you in veg.
i'd go with the 600 any day. you can always use a conversion bulb with plenty of blue light.
https://www.1000bulbs.com/product/115289/PX-MS6007200.html?utm_source=SmartFeedGoogleBase&utm_medium=Shopping&utm_term=PX-MS6007200&utm_content=MH+Bulbs+for+HPS+Ballasts&utm_campaign=SmartFeedGoogleBaseShopping&gclid=CjwKEAiA18mzBRCo1e_-y_KLpXISJACEsANGDxmeouqspXD5IzSXZbW4Vs6WfCrOe8XxaqwX1-avDRoCulTw_wcB
https://www.1000bulbs.com/product/115289/PX-MS6007200.html?utm_source=SmartFeedGoogleBase&utm_medium=Shopping&utm_term=PX-MS6007200&utm_content=MH+Bulbs+for+HPS+Ballasts&utm_campaign=SmartFeedGoogleBaseShopping&gclid=CjwKEAiA18mzBRCo1e_-y_KLpXISJACEsANGDxmeouqspXD5IzSXZbW4Vs6WfCrOe8XxaqwX1-avDRoCulTw_wcB
TJ baba
Well-Known Member
Ever get the 400w up and running?
joejoe4444
Well-Known Member
hi thanks for the intrest , i got it last night ( 20/12/15 ) just going to set it up and will be up and away
have you a project growing ?
TJ baba
Well-Known Member
Yep here is my journal, I'm running white widow about week 3 flower, https://www.rollitup.org/t/first-closet-grow.889558/page-3#post-12168409
skunkwreck
Well-Known Member
I run my 400 HPS (open bulb) 13" to 15" above the canopy and veg with a 400 MH (open bulb) about 12" to 13" above the canopy... try to get it close as you can without heat stress or light intensity stress .
