Which lights for 3 week old plants

[Ian48]

I have 3 plants at 3 weeks old they currently under a 250w hps bulb i also have a 250w hid or a 600w hps which bulb should i really be using now. These were just my test plants i got the seeds for free so not that bothered about them i have 3 blackberry autos under cfl lights that are 1 week old just trying to get rid of my mistakes with the free ones

 

[Hey1stTimeGuy]

I'd say if you have the proper ventilation start up the new light and get the atmosphere dialed in for the next round.

 

[Hobbes]

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Ian you don't want to veg under a red hps, it'll cause stretching and wide internodes.

What is your other HID? Any chance it's a MH? Got any other lights?

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[KingQuazy]

HPS is HID... If you're saying you also have a 250w MH.. then I say use that until it's time to flower. Too much red light in veg causes tall lanky stretchy plants.

 

[JoeBlow5823]

The 250 HPS should be fine but a MH would be ideal.

 

[Ian48]

These are the 2 bulbs i have and sorry its a 600w hps

 

[BucketGrower]

Never had any issues giving plants hps. They love it actually. Just pay attention to how hot it makes things.

 

[KingQuazy]

Never had any issues giving plants hps. They love it actually. Just pay attention to how hot it makes things.

Sure ya did. You just didn't know it. While the HPS can and will deliver yields from seed to harvest.. It lacks the Blue spectrum that really spurs the most vigorous growth in the vegetive state. That is why T5 and HID grow fixtures come with different options. The T5's offer a Blue-er 6400K or 6500K bulb for Vegging and the more red tinted 3000K or 2700K bulbs for "Bloom". Conversely, the HID ballasts often come with both MH andddd HPS bulbs. This is because the HPS lacks the proper light spectrum for optimal vegetating.

 

[Ian48]

Will the 400w MH be ok with 2 week olds they due to go in the tent on Wednesday and what distance from the tops of the plants should i put the 400w MH this is 12 days old i have had it under 23w cfl for 7 days at 3 inches away does it look ok or has it got a bit stunted growth

 

[Hobbes]

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What's the maximum space that you can have between the top of your plant and the 400w MH?

You want a good distance with seedlings as young as yours. Then lower inch by inch until it's flowering height.

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[BostonBuds]

3 small plants 3 weeks old i wouldn't waste the electricity running 600 watts, the 200 watt is fine until the plants grow larger. Is your lamp ballast switchable, I have a 400 watt and start at 50% then 75% then full as the plants get larger and fill out the grow area.

 

[spek9]

Will the 400w MH be ok with 2 week olds they due to go in the tent on Wednesday and what distance from the tops of the plants should i put the 400w MH this is 12 days old i have had it under 23w cfl for 7 days at 3 inches away does it look ok or has it got a bit stunted growth

My freshly rooted clones and seedlings that just broke dirt go under a 400W MH at 18-24" above the plants. The bulb is in an air cooled hood, but I have no ventilation running through it.

 

[Ian48]

I got everything all set up with 400w mh bulb and my temp has gone through the roof at 32oc and humidity 15% if i turn the ballast to 250w everything settles a 28oc and 35oc humidity

 

[KingQuazy]

Fans Fans Fans.

 

[Hobbes]

I got everything all set up with 400w mh bulb and my temp has gone through the roof at 32oc and humidity 15% if i turn the ballast to 250w everything settles a 28oc and 35oc humidity

If you've got a 250 watt option on your MH ballast by all means use that!

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[Ian48]

Will they veg in the orange light ?

 

[Hobbes]

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No well, you want a blue light around 6500 kelvins for veg.

Where'd you get the orange light?

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[Ian48]

Thats the colour it goes when i turn it down to 250w

 

[Hobbes]

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Ian I'd go to the LED lighting forum - subforum to Indoor - and post a threat asking about the color of your light and how it changes with wattage change. Ask them if it's OK to use that light with veg.

I suspect that you can, there are a lot of people in the LED forum who can give you a definitive answer.

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[Ian48]

Thanks for your help i have gave up for the day now going to try a new plan tomorrow