Light distance for pre flowering

[Lightyear]

I’m starting to see multiple white hairs popping out on the brackets. I’m assuming that I am in the pre flower stage. The manual for my light says 18-24 inches for veg and 12-18 for flower. Should I move it to 12 inches since I am in pre flower?

[Dman1969]

I would start at 18 and ease our way down.
What height are you now?

[MidwestGuy]

Light intensity is measured in PPFD (photosynthetic photon flux density.) You can get a phone app called Photone to measure the PPFD at the plant’s canopy. I run 1,000 PPFD during flower in my grow.

DLI (daily light integral) is another way to measure light intensity. DLI incorporates both PPFD and the number of hours of light per day that the plant is receiving.

Start using DLI

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…

[Lightyear]

24 inches

[Graysin]

@Lightyear

18 for flower

I’d start here and see how they respond. I’m loathe to put my lights closer than that.

[Dman1969]

What type of light you got?

[beachglass]

We love to see pics.

[Lightyear]

Spider farmer sf1000d

[kellydans]

I’m with @Graysin 18 inches is the closest I like to run my lights to plants. I’m usually more around 21 inches.
Good luck

[Jonesy287]

Photone app works wonders for me with DLI. No measuring distances.

[Lightyear]

Here are a couple of pics.

[Outlaw]

Spider Farmer’s recommendations for hanging height are usually the range to stay in. Like @MidwestGuy said DLI is the part the requires the most dialing in. Stay in the recommended range for hanging height and dial in DLI with the dimmer. Until I started using Photone (luckily I started very early into growing) I was basically just guessing.

[Lightyear]

My light does not have a dimmer.

[Jonesy287]

If you have someone else to help you raise and lower your light, then you can just hold your phone above your canopy while they raise and lower until you get the right DLI that way not a lot of ipdown

[Dman1969]

Looking very happy and healthy!

[Lightyear]

What should the DLI be?

[Jonesy287]

I would say start at like 40. See how they like it after a day or so. no leaf curling edges or any signs of light stress you can go higher. Here’s a graph that will help you with through the different stages of your plants life.