400W HPS light distance from seedlings

Discussion in 'First Time Marijuana Growers' started by Frankffs, Oct 25, 2017.

  1. #1 Frankffs, Oct 25, 2017
    hi guys! Planted my seeds last monday (so the plants on the right are at day 9)

    Plants on the left are at day 3 since monday morning.

    Light distance is at 34"
    Temp is always at 80-85. Never exceeds 85.

    So far i'm not giving nutes. I'll start doing so at half dosage next week for the plants on the left.

    Now I read a ton on the subject. But some people say to keep the plants from 1.5-2 feet away from the 400w HPS

    Sitting at 34" gives me about 2.9 ft distance from plants.

    Should I lower the lamp or keep it at 34"?

    Thanks!
     

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  2. #2 InfamousTree, Oct 25, 2017
    You shouldnt really run hps in veg as plants need more blues hps is more for flowering a mh is whats recommended
     
  3. #3 Ely Serra, Oct 25, 2017
    I read a lot on HPS vs MH for veg and so many people contradicts themselves... I think it is just a myth. I personnally grew HPS from seed to harvest since it brings less heat than MH. I am trying MH for veg now though (since i have an un used MH bulb, i dont want to over use the HPS)
     
  4. #4 Dr acula, Oct 26, 2017
    plants look fine. Put a temp gauge where your plants are so we can see the temp at the plant level. Are you using fans. Exhaust? more info
     
  5. #5 InfamousTree, Oct 26, 2017
    Hps it wayyyyy hotter than a mh
     
  6. #6 Frankffs, Oct 27, 2017
    Its at around 80 degrees farenheit where the plants are.
    41% humidity. I have an inline fan VTX 400 4"
     

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  7. #7 Dr acula, Oct 27, 2017
    Should be good then, mine fluctuate around 77-83 under light although im running 2 600 watt mh bulbs with 2 6’ fans, the room itself is probably around 70 or so. Get a oscilating fan. I noticed a good change in mine after I got one, not just the temp but helped the plants. Just 15 bucks for one
     
  8. #8 Frankffs, Oct 27, 2017
    Ok so what distance should I set the lamp from the plants? Right now its at 34"
     
  9. #9 Dr acula, Oct 27, 2017
    My 2 600s are 22 inches above my plants. But it just depends man. You want them as close as poasible without burning them up. It depends on your cooling
     
  10. #10 Frankffs, Oct 27, 2017
    Ok!
     
  11. #11 Frankffs, Oct 27, 2017
    Im going to get a 2nd clip fan tomorrow. Until then I lowered the light from 34" to 28"

    Let me also remind you that 2 of the seedlings are 5 days old and the 2 others are 12 days old. Once I get my 2nd clipfan i'll lower it to 20" and keep a close eye on em over the weekend!
     
  12. #12 Dr acula, Oct 27, 2017
    It shouldnt get too hot in there. Are you using a cool tube design? Just put your hand where your plant is and if it feels uncomfterable to you then raise it. Like i said too earlier, a cheap oscilating fan will help out moving cool air around
     

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