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
Which lights for 3 week old plants
- Thread starter Ian48
- Start date
Hey1stTimeGuy
Member
I'd say if you have the proper ventilation start up the new light and get the atmosphere dialed in for the next round.
JoeBlow5823
Well-Known Member
The 250 HPS should be fine but a MH would be ideal.
BucketGrower
Well-Known Member
Never had any issues giving plants hps. They love it actually. Just pay attention to how hot it makes things.
KingQuazy
Well-Known Member
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.
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
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BostonBuds
Well-Known Member
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.
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.
Hobbes
Well-Known Member
Hobbes
Well-Known Member
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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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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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