ROI-E 680 height and percentage at each stage?

[Scarecrow1g]

Second grow with this light and I still don't really understand how high I should be keeping the light and at what percentage. Currently I have seedlings that are 18 inches from the light and at 40% on the dimmer. When should I increase the dimmer and lower or raise the height of the light? I cant seem to find much online.

 

[MIGrampaUSA]

Second grow with this light and I still don't really understand how high I should be keeping the light and at what percentage. Currently I have seedlings that are 18 inches from the light and at 40% on the dimmer. When should I increase the dimmer and lower or raise the height of the light? I cant seem to find much online.

Do you have pictures of your plants? I have the ROI-E720 in one of my tents. I start seedlings in a different tent and then move them in to veg and flower. Earlier veg, 18"-24" light distance and 50%. Later in veg when the plants are beginning to bush out I use the same light distance and boost it to 75%. During flower it's set at 100%. I set the light at about 18" and let the plants stretch into it until they are about 10"-12" from the light before raising it again. Once they stop stretching, as long as no signs of light stress, you can settle in at about 12".

 

[Scarecrow1g]

Do you have pictures of your plants? I have the ROI-E720 in one of my tents. I start seedlings in a different tent and then move them in to veg and flower. Earlier veg, 18"-24" light distance and 50%. Later in veg when the plants are beginning to bush out I use the same light distance and boost it to 75%. During flower it's set at 100%. I set the light at about 18" and let the plants stretch into it until they are about 10"-12" from the light before raising it again. Once they stop stretching, as long as no signs of light stress, you can settle in at about 12".

Currently 24 inches from the light to the soil. Sprouts are maybe 1 inch tall. One seed hasn't sprouted yet.

 

[MIGrampaUSA]

You could probably go as low as 25% this early on. They don't need a ton of light just yet.

 

[lvstealth]

there is an app for light, get it

Lux Meter (Light Meter) - Apps on Google Play

Professional light intensity (lux) meter for your android device.

play.google.com

use this and i will have to look at my notes for the starting points, but that age and size low, and it is not a huge deal

Clones and seedlings: 2,000–4,000 lux and doesnt matter so much
Vegetative growth: 15,000–30,000 lux start at 20, watch plant. you are looking for leaves pointed up "praying"
Flowering: 45,000–110,000 lux the upper end needs co2. try starting at 65,000, watch and adjust

as for how high, try this (this is REAL wattage, so on an led look at actual wattage, an led that says 1000 is normally only 100w maybe 150w. no real standard.

• 5” to 11” for 150W lights
• 6” to 13” for 250W lights
• 8” to 19” for 400W lights
• 9” to 25” for 600W lights
• 11” to 31” for 1,000W lights

the key to it all is to spend the time watching them and adjust as they tell you

 

[MIGrampaUSA]

The problem with phone apps is not all phones are created equal. Mine is cheap and now almost 2 yrs old. I trust my lux meter over my phone. Lux meters will cost you some extra money. The phone app is free. If your phone's hardware is sufficient, the readings should be similar.

there is an app for light, get it

Lux Meter (Light Meter) - Apps on Google Play

Professional light intensity (lux) meter for your android device.

play.google.com

use this and i will have to look at my notes for the starting points, but that age and size low, and it is not a huge deal

Clones and seedlings: 2,000–4,000 lux and doesnt matter so much
Vegetative growth: 15,000–30,000 lux start at 20, watch plant. you are looking for leaves pointed up "praying"
Flowering: 45,000–110,000 lux the upper end needs co2. try starting at 65,000, watch and adjust

as for how high, try this (this is REAL wattage, so on an led look at actual wattage, an led that says 1000 is normally only 100w maybe 150w. no real standard.

• 5” to 11” for 150W lights
• 6” to 13” for 250W lights
• 8” to 19” for 400W lights
• 9” to 25” for 600W lights
• 11” to 31” for 1,000W lights

the key to it all is to spend the time watching them and adjust as they tell you

Please do not attempt 110,000 lux. Most people don't go above 85,000 lux even in a CO2 enriched environment. 110,000 lux is bright outdoor sun in an environment you cannot reproduce indoors. However, the charts above will serve you well as long as you aren't trying to pursue the maximum. 65k really should be sufficient without CO2 enrichment.

 

[lvstealth]

doesnt matter if they are good or accurate. it is a jumping off point, as @Aqua Man said. get it at the distance you think is good and start at the number i said and watch the plant

watch the plant

watch the plant

all you have to do is go up/down and more/less intensity, in very small increments, you want the plants top leaves at about a 35 to 40 degree angle, as though they are praying.

you dont care what the numbers are for exact - if the numbers are perfect and you have a gazillion dollar meter, you still need to watch the plant and see what SHE likes. they are all different.

i use 4 different lights and raise and lower and adjust intensity on each to get each plant where she likes it

when the lights come on, i will grab a pic to show you

 

[Scarecrow1g]

there is an app for light, get it

Lux Meter (Light Meter) - Apps on Google Play

Professional light intensity (lux) meter for your android device.

play.google.com

use this and i will have to look at my notes for the starting points, but that age and size low, and it is not a huge deal

Clones and seedlings: 2,000–4,000 lux and doesnt matter so much
Vegetative growth: 15,000–30,000 lux start at 20, watch plant. you are looking for leaves pointed up "praying"
Flowering: 45,000–110,000 lux the upper end needs co2. try starting at 65,000, watch and adjust

as for how high, try this (this is REAL wattage, so on an led look at actual wattage, an led that says 1000 is normally only 100w maybe 150w. no real standard.

• 5” to 11” for 150W lights
• 6” to 13” for 250W lights
• 8” to 19” for 400W lights
• 9” to 25” for 600W lights
• 11” to 31” for 1,000W lights

the key to it all is to spend the time watching them and adjust as they tell you

ok I downloaded the meter, the ROI-E 680 is 680 watts. It has 40,60,80 and 100 percent settings. So I want to keep the light 9 to 25 inches? And then also make sure the lux is within the range stated above? So if the lux is too high bring the light up, too low bring it down? When to I change the light percentages?

 

[Scarecrow1g]

Currently at the same height as my seedlings I am at 20k lux, light is 24 inches away. Light is at 40%

 

[MIGrampaUSA]

Currently at the same height as my seedlings I am at 20k lux, light is 24 inches away. Light is at 40%

Watch for light stress. 15-20k is ballpark, but individual plants will behave differently sometimes. Sometimes the difference is simply moving the plant a few inches away from the center of the light if you see light stress.

 

[lvstealth]

im just guessing, but someone who asks about light distance isnt going to recognize light stress. you might want to define what that is, and what it looks like

 

[Scarecrow1g]

im just guessing, but someone who asks about light distance isnt going to recognize light stress. you might want to define what that is, and what it looks like

I have no idea what light stress is haha

 

[MIGrampaUSA]

I have no idea what light stress is haha

Ok fair enough ... Here's some extracurricular reading for you: https://www.growweedeasy.com/cannabis-plant-problems/light-burn

 

[Pushrod Monkey]

Ditch the dome. Domes are for clones. Domes encourage damping off of seedlings.