User Tag List

Informational! Informational!:  0
Likes Likes:  0
Results 1 to 7 of 7

Thread: Distance from Lights?

  1. #1
    Getting There...
    Join Date
    Sep 2008
    Location
    Madison, WI USA
    Posts
    816
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Distance from Lights?

    So for years now, most of my plants have been under 4-Bulb T5 fixtures, maybe 9 inches form them.
    I've recently added some mars hydro LED fixtures to a separate shelf. I'm afraid of frying any plants (mainly sundews and pings), and am wondering if 9 inches is going to be too close? Wondering if anyone could offer advice for the best distance to an LED fixture for various types of plants?

    Thank you,

    Kyle

  2. #2
    hcarlton's Avatar
    Join Date
    Apr 2012
    Location
    Greeley, CO, USA
    Posts
    4,086
    Mentioned
    23 Post(s)
    Tagged
    0 Thread(s)
    When I replaced most of my T8's with LED, the change in distance didn't fry anything, just dramatically increased red color for a few months before they all settled in (still far more colored than before though). LED's are not supposed to be high heat lights, so temperature-wise they shouldn't be any worse, and brightness-wise the plants just need time to acclimate.
    Everything has a reason, whether big or small. Never underestimate the power of what is or is not.
    There is far more to everything than meets the eye.
    Growlist

  3. #3
    I hate bugs. Carnivorous plants get me. jpappy789's Avatar
    Join Date
    Apr 2010
    Location
    Miami, FL
    Posts
    1,184
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Which model do you have? Those Mars fixtures are pretty powerful LEDs, they won't need to be that close. But as Hawken said, heat's less of an issue compared to fluorescents.

    The only thing I would be especially careful about is that Neps might show signs of "light burn" if they're getting too much light. Most dews, Pings, etc. probably won't mind getting blasted with more.
    -Josh
    Grow list

  4. #4
    Admin- I'm growing CPs in the Desert of Tucson, Az. adnedarn's Avatar
    Join Date
    Jul 2001
    Location
    Tucson, Arizona USA
    Posts
    8,778
    Mentioned
    9 Post(s)
    Tagged
    1 Thread(s)
    If you're happy with the way your plants look under your current lights and want to match that, it is likely that your phone has a light sensor you can use. Download an app and you should be able to see the data then you can measure your old lights and adjust the new ones to provide a similar intensity. For my Samsung I use an app called "Galaxy sensors".
    -Andrew
    Owner of TerraForums, FlyTrapShop.com, and cpforums.org.
    Support FlyTrapShop, support TerraForums! www.flytrapshop.com

  5. #5

    Join Date
    Aug 2019
    Posts
    13
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Assuming you have the Mars hydro 300w, 9 inches is unnecessarily close, especially for sundews and pings. I would keep the light at a height of 18-24 inches above the canopy of your plants. But keep in mind that the light intensity varies according to where you place a plant under the light. This is a PPFD map at 18" for the mars hydro 300 (taken from the mars hydro page on amazon): https://images-na.ssl-images-amazon....L._SL1500_.jpg

    Place plants that need most light under the middle of the light. If you're unsure of how much light a plant can take, place it a foot away from the middle and start moving it towards the middle little by little. Once you notice it coloring up nicely, you're giving them enough light. Lots of my pings like to be BLASTED with light.

    Quote Originally Posted by adnedarn View Post
    If you're happy with the way your plants look under your current lights and want to match that, it is likely that your phone has a light sensor you can use. Download an app and you should be able to see the data then you can measure your old lights and adjust the new ones to provide a similar intensity. For my Samsung I use an app called "Galaxy sensors".
    That approach usually doesn't work well for blurple lights. Though depending on what phone you have, this approach may be a good starting poing: https://www.youtube.com/watch?v=AjkEJjlzGv8

  6. #6
    Admin- I'm growing CPs in the Desert of Tucson, Az. adnedarn's Avatar
    Join Date
    Jul 2001
    Location
    Tucson, Arizona USA
    Posts
    8,778
    Mentioned
    9 Post(s)
    Tagged
    1 Thread(s)
    Ah, I didn't even look at the light... I only have used whites.
    -Andrew
    Owner of TerraForums, FlyTrapShop.com, and cpforums.org.
    Support FlyTrapShop, support TerraForums! www.flytrapshop.com

  7. #7
    Getting There...
    Join Date
    Sep 2008
    Location
    Madison, WI USA
    Posts
    816
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Thanks for all the really useful info. I've downloaded an app to test the output and will be scaling the plants back a bit!

Similar Threads

  1. Light distance issue.
    By Jcal in forum Greenhouses, Terrariums and Bog Gardens
    Replies: 15
    Last Post: 02-24-2015, 09:36 AM
  2. Distance from light (all species)
    By mato in forum Greenhouses, Terrariums and Bog Gardens
    Replies: 9
    Last Post: 10-26-2011, 07:35 PM
  3. Lighting distance
    By Nickz123 in forum Tropical Pitcher Plants  (Nepenthes)
    Replies: 2
    Last Post: 11-26-2004, 10:47 PM
  4. Lighting distance
    By Nickz123 in forum Greenhouses, Terrariums and Bog Gardens
    Replies: 0
    Last Post: 11-26-2004, 09:05 PM
  5. Flourex minimum distance
    By sharp229 in forum Greenhouses, Terrariums and Bog Gardens
    Replies: 4
    Last Post: 05-11-2004, 06:34 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •