# Lighting in a 3x3 **URL:** \ **Category:** Preparations\ **Created:** [July 27, 2023, 4:50pm UTC](https://ilgmforum.com/t/lighting-in-a-3x3/103548 "2023-07-27T16:50:15Z")\ **Posts on this page:** 20\ **Page:** 1
**Author:** ![ArtVandelay](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/artvandelay/32/700792_2.png) [@ArtVandelay](https://ilgmforum.com/u/ArtVandelay)\ **Post date:** [July 27, 2023, 4:50pm UTC](https://ilgmforum.com/t/lighting-in-a-3x3/103548/1 "2023-07-27T16:50:15Z")
@dbrn32 hey it’s been a while since I’ve been on the site I have a question for you, i am currently in a 3x3 I have an HLG 600r that I use but I also have 2 spider farmer SE3000s that I hooked together to fit inside the 3x3… but with the spider farmer 3 of the light bars are about 2 inches higher that the other( not sure if that matters lol) and I’m able to have ballast outside of tent. Now which light would you use ? ---
**Author:** ![ArtVandelay](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/artvandelay/32/700792_2.png) [@ArtVandelay](https://ilgmforum.com/u/ArtVandelay)\ **Post date:** [July 27, 2023, 4:51pm UTC](https://ilgmforum.com/t/lighting-in-a-3x3/103548/2 "2023-07-27T16:51:24Z")
![image](https://global.discourse-cdn.com/growingmarijuana/original/4X/1/e/c/1ec69196fcf6519361135da5bce8939975d63df6.jpeg) ---
**Author:** ![JimWantsToGrow](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/jimwantstogrow/32/908070_2.png) [@JimWantsToGrow](https://ilgmforum.com/u/JimWantsToGrow)\ **Post date:** [July 27, 2023, 5:19pm UTC](https://ilgmforum.com/t/lighting-in-a-3x3/103548/3 "2023-07-27T17:19:58Z")
For me it would really depend on the final height I have to work with. I’m in a 72" tent by ACI and I need those two inches. I have to super crop as it is and my lights are attached to the top bar. Two great sets of lights BTW. ---
**Author:** ![Autos-only](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/autos-only/32/846017_2.png) [@Autos-only](https://ilgmforum.com/u/Autos-only)\ **Post date:** [July 27, 2023, 6:12pm UTC](https://ilgmforum.com/t/lighting-in-a-3x3/103548/4 "2023-07-27T18:12:19Z")
600 watts in a 3x3? WOW impressive, how much DLI are you trying to achieve? ---
**Author:** ![ArtVandelay](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/artvandelay/32/700792_2.png) [@ArtVandelay](https://ilgmforum.com/u/ArtVandelay)\ **Post date:** [July 27, 2023, 7:06pm UTC](https://ilgmforum.com/t/lighting-in-a-3x3/103548/5 "2023-07-27T19:06:31Z")
So the HLG says height above canopy is what 28” recommended, and the driver creates a lot of heat The SE3000s I’m able to have the light anywhere from 6”-18”, I’m able to hang the drivers outside of the tent and it’s literally full coverage again the 3 light bars on the right are a little higher than the rest of the light bars again not sure if that even matters? I’m even able to hang my HLG uva in the middle of the spider farmer… But I’ve had great yields with the HLG !!! I am growing in a gorilla tent so it’s a 6”11. DLI not to sure what that means I know I don’t want any light burn though ---
**Author:** ![JimWantsToGrow](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/jimwantstogrow/32/908070_2.png) [@JimWantsToGrow](https://ilgmforum.com/u/JimWantsToGrow)\ **Post date:** [July 28, 2023, 10:08am UTC](https://ilgmforum.com/t/lighting-in-a-3x3/103548/6 "2023-07-28T10:08:53Z")
Very good point. That is one of the reasons I am considering upgrading to the SF SE4500 myself. The heat from the ACI lights is 120 degrees at the controllers. ---
**Author:** ![MidwestGuy](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/midwestguy/32/914277_2.png) [@MidwestGuy](https://ilgmforum.com/u/MidwestGuy)\ **Post date:** [July 28, 2023, 10:17am UTC](https://ilgmforum.com/t/lighting-in-a-3x3/103548/7 "2023-07-28T10:17:54Z")
> [@ArtVandelay](#): > > DLI not to sure what that means Light burn rarely happens unless the light is so close that the heat from the light is reaching the plant. You would have to have the light within ~12 inches with poor airflow for that to happen. This may be helpful: > [@Start using DLI](https://ilgmforum.com/t/start-using-dli/64987): > > Daily Light Interval (DLI) is a quick and efficient way to calculate how much light our plants are receiving within a 24hr period, allowing for easy light adjustments. DLI will help you and the community to better understand your lighting in a more universal term, leading to clearer communication of what the true light value is. Almost all smartphones have the ability to use an app (we will get to this don’t jump the gun) in order to calculate DLI, and if that is not an option a cheap LUX meter… ---
**Author:** ![dbrn32](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/dbrn32/32/533801_2.png) [@dbrn32](https://ilgmforum.com/u/dbrn32)\ **Post date:** [July 28, 2023, 3:48pm UTC](https://ilgmforum.com/t/lighting-in-a-3x3/103548/8 "2023-07-28T15:48:41Z")
I would probably run the 600r dimmed down if you dont have a bigger space for it. ---
**Author:** ![ChittyChittyBangin](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/chittychittybangin/32/1095484_2.png) [@ChittyChittyBangin](https://ilgmforum.com/u/ChittyChittyBangin)\ **Post date:** [July 28, 2023, 4:16pm UTC](https://ilgmforum.com/t/lighting-in-a-3x3/103548/9 "2023-07-28T16:16:19Z")
These were grown under a 600r. ![1000002911](https://global.discourse-cdn.com/growingmarijuana/original/4X/f/6/e/f6e0f512e7aa215e620f516d8cf4a6b45922ae75.jpeg) ![1000002912](https://global.discourse-cdn.com/growingmarijuana/original/4X/3/3/0/330cba37a2c640afb073d18cdf485aed47bacf21.jpeg) ---
**Author:** ![anon34311147](https://avatars.discourse-cdn.com/v4/letter/a/c89c15/32.png) [@anon34311147](https://ilgmforum.com/u/anon34311147)\ **Post date:** [July 28, 2023, 6:30pm UTC](https://ilgmforum.com/t/lighting-in-a-3x3/103548/10 "2023-07-28T18:30:45Z")
Ths is a topic have been only guessing with on my first grow here. I have 3 HLG lights in m 4×4 gorilla tent. 300L Rspec, 200 Rspec and 320 FR Rspec. About 780 watts total. I am in flower and i have them all about 15 inches, give or take an inch, from the canopys. I am using DLI of about 40-50 and ppfd 800-1000. I have them dimmed down some. Question is : should i have them cranked up high and lower them a few inches over using DLI. The leaves arent getting that hot with the HLG lights.?? ---
**Author:** ![Nicky](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/nicky/32/397422_2.png) [@Nicky](https://ilgmforum.com/u/Nicky)\ **Post date:** [July 29, 2023, 12:06am UTC](https://ilgmforum.com/t/lighting-in-a-3x3/103548/11 "2023-07-29T00:06:01Z")
DLI is the best gauge you can easily get to aim your lights, otherwise your just guessing (and every environment is different so advice from others has a significant margin of error to it) Its an app on your phone and a number you relate to a graph… Fairly easy ---
**Author:** ![ArtVandelay](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/artvandelay/32/700792_2.png) [@ArtVandelay](https://ilgmforum.com/u/ArtVandelay)\ **Post date:** [July 29, 2023, 1:38am UTC](https://ilgmforum.com/t/lighting-in-a-3x3/103548/12 "2023-07-29T01:38:12Z")
Okay so I would need a par meter ? I was looking into a thread earlier and downloaded the photon app and read I had to put the piece of paper over front camera, then I saw a photobio by Phantom was fairly cheap for what it is compared to apogee. ---
**Author:** ![anon34311147](https://avatars.discourse-cdn.com/v4/letter/a/c89c15/32.png) [@anon34311147](https://ilgmforum.com/u/anon34311147)\ **Post date:** [July 29, 2023, 10:51am UTC](https://ilgmforum.com/t/lighting-in-a-3x3/103548/13 "2023-07-29T10:51:31Z")
The Photone app is the most accurate one out of them all. The paper diffuser over the camera lenz is only for Apple i phones not Android. If this helps. ---
**Author:** ![anon34311147](https://avatars.discourse-cdn.com/v4/letter/a/c89c15/32.png) [@anon34311147](https://ilgmforum.com/u/anon34311147)\ **Post date:** [July 29, 2023, 10:54am UTC](https://ilgmforum.com/t/lighting-in-a-3x3/103548/14 "2023-07-29T10:54:10Z")
Okay, i get all of this but, i only needed to find out how important it was to have your lights a certain height from the tops. Like their was a certain magic height to help them flower denser… but, it is all about DLI for me. ---
**Author:** ![Nicky](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/nicky/32/397422_2.png) [@Nicky](https://ilgmforum.com/u/Nicky)\ **Post date:** [July 30, 2023, 3:53am UTC](https://ilgmforum.com/t/lighting-in-a-3x3/103548/15 "2023-07-30T03:53:45Z")
You don’t need a par meter, read my thread about DLI. @anon34311147 > [@anon34311147](#): > > Like their was a certain magic height to help them flower denser No Flowers don’t care if your light is far aware or close, it only cares about DLI, VPD (this includes how hot the top colas are getting), Co2 concentration, wind/stress, nutrients, and whaf the genetic plan is telling it to do. Refer to my modified DLI chart and just don’t bleach you lights by having them to closer and to powerful or to weak ---
**Author:** ![ArtVandelay](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/artvandelay/32/700792_2.png) [@ArtVandelay](https://ilgmforum.com/u/ArtVandelay)\ **Post date:** [July 30, 2023, 7:42pm UTC](https://ilgmforum.com/t/lighting-in-a-3x3/103548/16 "2023-07-30T19:42:16Z")
Okay I will have some questions for you soon lol ---
**Author:** ![Woodrow](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/woodrow/32/450412_2.png) [@Woodrow](https://ilgmforum.com/u/Woodrow)\ **Post date:** [July 30, 2023, 7:57pm UTC](https://ilgmforum.com/t/lighting-in-a-3x3/103548/17 "2023-07-30T19:57:58Z")
@ArtVandelay It’s best to read @Nicky post about DLI. I’ve had 2 runs and still learning the DLI rule. This is my last run with a yield from two plants under a HLG 320 in a 3x5 17.5 oz I also have the Photone app. Good luck and happy growing. ![IMG_5580](https://global.discourse-cdn.com/growingmarijuana/original/4X/b/3/b/b3b075e4597461a757e66c19e7344f6ab99f2fe2.jpeg) ![IMG_5605](https://global.discourse-cdn.com/growingmarijuana/original/4X/1/f/b/1fbc2941dbdb70e3e9daa9ae3f4a986a7678c006.jpeg) ---
**Author:** ![Nicky](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/nicky/32/397422_2.png) [@Nicky](https://ilgmforum.com/u/Nicky)\ **Post date:** [July 31, 2023, 1:30am UTC](https://ilgmforum.com/t/lighting-in-a-3x3/103548/18 "2023-07-31T01:30:05Z")
Nice density, I have definitely seen your grows greatly improve since you joined the forums. You yourself are now a wealth of knowledge. Nice setup! Just need some autopots =p ---
**Author:** ![ArtVandelay](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/artvandelay/32/700792_2.png) [@ArtVandelay](https://ilgmforum.com/u/ArtVandelay)\ **Post date:** [August 3, 2023, 5:41pm UTC](https://ilgmforum.com/t/lighting-in-a-3x3/103548/19 "2023-08-03T17:41:59Z")
Got a par meter I’m currently at seedling week 1 DLI is currently 18… to much or to little ? Is there a chart that I should be going by? ---
**Author:** ![Bonjoyle](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/bonjoyle/32/711825_2.png) [@Bonjoyle](https://ilgmforum.com/u/Bonjoyle)\ **Post date:** [August 3, 2023, 9:32pm UTC](https://ilgmforum.com/t/lighting-in-a-3x3/103548/20 "2023-08-03T21:32:48Z")
> [@ArtVandelay](#): > > Is there a chart that I should be going by? > [@Nicky](#): > > Refer to my modified DLI chart Nicky offered up that info buddy [Next page](https://ilgmforum.com/t/lighting-in-a-3x3/103548.md?page=2)