Mh Or Hps

[speero_m]

i have been growing for years now..but Outdoors Aiming for monster plants!! Now i started indoor growing, my problem is that resources are Scarce!! Question, is it better to use 2 MH 400W lamps or a mix OF 1 MH & 1 HPS for veg stage? and if im growing them in big room 5mx6m do i need any kind of ventilation?

[Stoney Bud]

i have been growing for years now..but Outdoors Aiming for monster plants!! Now i started indoor growing, my problem is that resources are Scarce!! Question, is it better to use 2 MH 400W lamps or a mix OF 1 MH & 1 HPS for veg stage? and if im growing them in big room 5mx6m do i need any kind of ventilation?
Hey speero_m, one of my rooms is 12 feet x 14 feet, (3.66 x 4.27 meters), and using two 430 watt HPS, with an ambient temperature of about 70F, (21.11C), in the house, that room stays at 75-80 degrees F. (23.88 - 26.66 C.)

That's with fans blowing.

MH are better for vegging. HPS for flowering. If the wallet is an issue, HPS works great for both. That's what I use.

Good luck to you man!

[speero_m]

Thanks....so i need the fan even if im placing the plant in the open....
$ is not a problem .....finding what i need is...So HPS FOR BOTH NICE

[Growdude]

i have been growing for years now..but Outdoors Aiming for monster plants!! Now i started indoor growing, my problem is that resources are Scarce!! Question, is it better to use 2 MH 400W lamps or a mix OF 1 MH & 1 HPS for veg stage? and if im growing them in big room 5mx6m do i need any kind of ventilation?

For the Veg stage I would go with the two MH and use the HPS for flowering.

[thedutchmaster3]

you can get 400 and 600 watt mh/hps systems on ebay...that way you can use MH for veg and HPS for flower

[speero_m]

Is the light to close???

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Hey guys....any suggestions..these are pics of my nw babys but some leaves are turning yellow and i need to know the reason!!! im not using fer..watering when they ask for it...is the light to close? the plants are 3 weeks old. help anyone!
Attached Thumbnails

[speero_m]

http://www.marijuanapassion.com/forum/attachment.php?attachmentid=14811&d=1167922584

[speero_m]

http://www.marijuanapassion.com/forum/attachment.php?attachmentid=14812&d=1167922655
http://www.marijuanapassion.com/forum/attachment.php?attachmentid=14813&d=1167922726

[Stoney Bud]

Hey Speerom, The plants are looking good. The light looks ok, but I can't really tell what wattage it is. Maybe a 150?

[speero_m]

400 Mh It Has Built In Ballast! Im Installing Another One Soon! I Found 1000hps Fully Loaded For 500$ Would It Cost Me Less On E-bay?

[KADE]

400 Mh It Has Built In Ballast! Im Installing Another One Soon! I Found 1000hps Fully Loaded For 500$ Would It Cost Me Less On E-bay?

Ebay is hit and miss... sometimes HUGE savings.. sometimes rip offs..

I paid $150 for ballast, $60 for bulb and $80 for reflector when I first started. And the guy gave me a first timers break and sold it all together for $275. (this was a 1000w hps setup) This was also not on ebay.

[Stoney Bud]

400 Mh It Has Built In Ballast!

A 400 watt light should be about 18 inches from the top of the plants. Any closer, and you run the risk of infrared light damage. Infrared isn't affected by fans or ventilation. It goes directly from the light to the surface of whatever it hits. A 400 watt light emits enough infrared to damage a plant from less than 18 inches away.

It's just like the infrared in sunlight. On a moderately cloudy day with a real good breeze going, you can still get one hell of a sunburn on your body from the infrared that comes through the cloud cover. That's exactly the same problem with light distance on plants.

They should make a sun block for plants.....SPF 1000

Hhahhahahaha

I've thought about getting an infrared blocking lens for a light and see how that works with a trial grow. It could block the infrared and allow the light to be much closer; (in theory anyway).

[Growdude]

A 400 watt light emits enough infrared to damage a plant from less than 18 inches away.

It's just like the infrared in sunlight. On a moderately cloudy day with a real good breeze going, you can still get one hell of a sunburn on your body from the infrared that comes through the cloud cover. That's exactly the same problem with light distance on plants.

They should make a sun block for plants.....SPF 1000

Hhahhahahaha

I've thought about getting an infrared blocking lens for a light and see how that works with a trial grow. It could block the infrared and allow the light to be much closer; (in theory anyway).

Do you mean ultraviolet? You get a sunburn from ultaviolet.

[Stoney Bud]

Do you mean ultraviolet? You get a sunburn from ultaviolet.
Ha! With the sun, yes, with the plant light, it's the infrared. Same principle tho'.

[speero_m]

YOUR SAYING 18 INCES THAT IS APPROX 47CM...ISN'T TAHT TO FAR...DONT U RISK HAVING A LONG EMPTY PLANT...INSTEAD OF HAVING A BUSHY PLANT? MINE ARE LIKE 20CM FROM THE LIGHT AND THEY ARE OK? AM I DOING IT WRONG OR MY LIGHT IS DIFF TO REGULAR 400MH??? tHANKS.

[speero_m]

Stony Bud Can U Please Check My Thread In (lights) And Reply On One My OF Quesytions.... Appreciate It :)

[speero_m]

THERE IS NOTHING LIKE SUN DO U AGREE?
THIS IS MY LAST OUTDOOR GROW!:rolleyes: BEFORE I STARTED INDOOR

[Stoney Bud]

YOUR SAYING 18 INCES THAT IS APPROX 47CM...ISN'T TAHT TO FAR...DONT U RISK HAVING A LONG EMPTY PLANT...INSTEAD OF HAVING A BUSHY PLANT? MINE ARE LIKE 20CM FROM THE LIGHT AND THEY ARE OK? AM I DOING IT WRONG OR MY LIGHT IS DIFF TO REGULAR 400MH??? tHANKS.

If you take the back of your hand and hold it beneath the light, when it feels like almost no heat is hitting your hand, that's the correct height.

Watch your plants closely and if you get any sign of heat stress, raise the light. Each reflector and bulb has different characteristics, so you have to see what your bulb and reflector do for you.