How Far Should Grow Lights Be From Plants? And How Long Should Grow Lights Be On For Each Day?

In this video, we address two key questions about grow light use for the at-home grower
1) How Far Should Grow Lights Be From Plants?
2) How Long Should Grow Lights Be On For Each Day?

At the end of this video we provide some useful tables to will allow you to determine the right distance for your plants and their lights.
00:00 - Introduction
00:21 - Table of Content
01:52 - Daily Light Integral
03:02 - Light Duration & Photoperiodism
05:05 - Grow Light Duration Chart
06:45 - Light Intensity and PPFD

For additional information about the content discussed in this video:

DOWNLOAD THE GROW LIGHT CALCULATORS from this video (and more):

GROW LIGHT DISTANCE:

GROW LIGHT TIMING:

WHY PLANTS NEED TO SLEEP:

SHOP OUR GROW LIGHT COLLECTION:

Find us online:

[GetUrbanLeaf]

DOWNLOAD OUR FREE GROW LIGHT CALCULATORS HERE

[rcrhinehart]

I'm setting up a growing area here in Boston for the winter. I was getting SAD due to PPFD/PTSD from TMI on the WWW. Thanks for finally making all of this crystal clear! Liked and subscribed.

[joannparker]

I appreciate your expertise. I grow succulents. And now that we’re entering the coldest part of winter, I’ve moved them indoors. And they’ll be inside for many weeks. I’m already seeing signs of light deprivation on several of them.

[SignatureEdits]

This was fantastic. Thank you for the time you put into this!

[terrim.]

Fabulous video!! Definably watching it again and subscribed!

[klemmr]

This is golden content, thanks. Day length has caused all kinds of issues for me.

[Inikatamami]

This is amazing.. thank you for making this content.. love it! I just started planting and this help a lot

[Dbeattie]

Great video! Thank you for making it simple with the sprinkler and bucket analogy for the under educated like meI fully understand this, btw you would make a great science teacher or teacher in general!

[asterixky]

I feel so bad for your wall and furniture getting so wet, but thanks for all this great info. 👍👍

[valeriesanchez]

Have a mars hydro ts 1000.
Set dimmer at 50% for seedling/veg with an 18-24" distance from canopy.
Timer at 16 hours on per day.

Flowering 12" distance dimmer at 75% timer set for 12 hours on daily.

Has worked wonderfully.

[orchiddo]

If there are some practical tips for the most common plants, it's wonderful. Thank you for the knowledge.

[asddsfdsaasdf]

beautifull way to explain physics thank you

[jradplowman]

Great video... struggling with indoor lettuce, but I am realizing that I can't really mix and match plants like I am doing. Thinking of hanging mylar between my two lights for each plant type.

[bigmama]

I feel like I finally understand. Thank you so much!

[H.R.H-Amina_Bin_Shafiq-SHAKTI]

I would really like spread sheet but when i sent in my email i didnt recieve the download. thanx

[MARTINREN]

I know that phone lux meters are very inacurate, but my current lights show between 3500-4000 lux depending on the distance. Now, i dont know if thats enough but im waiting for more lights to come.

Im currently planting : Basii, Bell peppers, Cherry tomatoes, Lemon mint and Perilla. Also, as of now, im lighting them up 24/7 . I might change it up as soon as the extra lights come.

[SHPAK_KKK]

I didn’t quite understand what these numbers inside the table mean. Do you have a video that discusses this topic in more detail?

[xxxxxx]

Hello,

thank you for the helpful information.Great video.
where do I find the Grow Light Distance Calculator?

Thanks in advance

[caleb_]

Entered my email as well, received nothing in return. Might I assume that in order to actually acquire the spread sheet, that agreeing to receive the text notifications would make it possible??🤔

[arthursulenski]

I am retired in Costa Rica and am setting up an LED grow light system. i will be raising inside veggies that we can't get here. Any help/direction you can give would be great. Thanks for what you do.