20/4 vs 24/0 💡

valiotoro

216

367

1mo ago

VEG

SE7000 Light Emitting Diodes/650W

Spider Farmer

FLO

SE7000 Light Emitting Diodes/650W

Spider Farmer

Tent

Mammoth Classic+ 150

Mammoth Tents

Soil

Perlite

Indoor

Room Type

11 l

Pot Size

2 l

Watering

Start at Harvest

1/2

valiotoro This run is a side-by-side experiment to compare two different light schedules on autoflowers: 20 hours of light (20/4) versus 24 hours of light (24/0). The goal is to see if running 24h of continuous light actually improves growth, yield, and overall plant health compared to a more traditional 20/4 cycle. Both plants are grown under the same conditions: • Same genetics • Same medium • Same nutrients • Same environment (temperature, humidity, airflow) The only variable in this grow is the light cycle.💡 Let’s find out: is 24/0 really worth it, or is 20/4 the sweet spot for autoflowers? I already have my own opinion on this, and I believe that under 24/0, even the smallest mistake can hit hard and show up fast. This run will confirm (or challenge) that idea…👀

33 likes

18 comments

Used method

Glass Of Water

Germination Method

1/7

6 cm

Height

24 hrs

Light Schedule

25 °C

Day Air Temp

6.5

700 PPM

TDS

55 %

Air Humidity

22 °C

Solution Temp

20 °C

Substrate Temp

20 °C

Night Air Temp

11 l

Pot Size

0.5 l

Watering Volume

30 cm

Lamp Distance

Nutrients 2

DryPart Grow

0.8 mll

Pro Roots

0.2 mll

valiotoro Week one is done ✔️ So far, no major differences both are growing at exactly the same pace. No signs of leaf burn or light stress. The substrate is drying a bit faster on the 24h one, which is totally normal.

24 likes

2 comments

1/7

6 cm

Height

24 hrs

Light Schedule

25 °C

Day Air Temp

6.5

700 PPM

TDS

55 %

Air Humidity

22 °C

Solution Temp

20 °C

Substrate Temp

20 °C

Night Air Temp

11 l

Pot Size

0.5 l

Watering Volume

30 cm

Lamp Distance

Nutrients 2

DryPart Grow

0.8 mll

Pro Roots

0.2 mll

valiotoro End of week 2 😄 No noticeable differences yet between them. I bumped the light up to 60% on the 20/4 schedule. The 24/0 is still running at 40% to keep things stress-free for now.

18 likes

2 comments

1/12

20 cm

Height

24 hrs

Light Schedule

25 °C

Day Air Temp

6.5

55 %

Air Humidity

22 °C

Solution Temp

20 °C

Substrate Temp

22 °C

Night Air Temp

11 l

Pot Size

0.5 l

Watering Volume

30 cm

Lamp Distance

Nutrients 2

DryPart Grow

0.8 mll

Pro Roots

0.2 mll

valiotoro They’re deep in the stretch phase, so bud sites should start forming very soon. I’m lucky to be running two identical phenotypes for this test, which is ideal. Still can’t spot any real difference between them…

24 likes

2 comments

1/11

20 cm

Height

24 hrs

Light Schedule

25 °C

Day Air Temp

6.5

900 PPM

TDS

55 %

Air Humidity

22 °C

Solution Temp

20 °C

Substrate Temp

22 °C

Night Air Temp

11 l

Pot Size

1 l

Watering Volume

30 cm

Lamp Distance

Nutrients 2

DryPart Grow

0.8 mll

Pro Roots

0.2 mll

valiotoro Insane vigor! Buds are stacking all over this is looking like it’s going to be a top harvest. The aroma is already coming through strong, sweet candy with a spicy twist 🤤 The plant under 24/0 is showing roughly 15% more bud development compared to the 20/4.🔥

18 likes

5 comments

1/13

20 cm

Height

24 hrs

Light Schedule

25 °C

Day Air Temp

6.5

1000 PPM

TDS

55 %

Air Humidity

22 °C

Solution Temp

20 °C

Substrate Temp

22 °C

Night Air Temp

11 l

Pot Size

1 l

Watering Volume

30 cm

Lamp Distance

Nutrients 2

DryPart Bloom

0.8 mll

Pro Bloom

0.2 mll

valiotoro Let’s gooo, flowering has officially started hehe!🔥 The one under 24h light is slightly ahead in bud formation.No signs of light stress, so we’re keeping it going.👌

24 likes

comments

1/10

20 cm

Height

24 hrs

Light Schedule

25 °C

Day Air Temp

6.5

1000 PPM

TDS

55 %

Air Humidity

22 °C

Solution Temp

20 °C

Substrate Temp

22 °C

Night Air Temp

11 l

Pot Size

1 l

Watering Volume

30 cm

Lamp Distance

Nutrients 2

DryPart Bloom

0.8 mll

Pro Bloom

0.2 mll

valiotoro All good so far! The terps are already really nice reminds me of rhubarb with a spicy twist 🤤 Both plants are in perfect health with no signs of stress at all, so I’m going to keep increasing the intensity and push it up to 80%.

23 likes

5 comments

1/14

70 cm

Height

24 hrs

Light Schedule

25 °C

Day Air Temp

6.5

1000 PPM

TDS

55 %

Air Humidity

22 °C

Solution Temp

20 °C

Substrate Temp

22 °C

Night Air Temp

11 l

Pot Size

2 l

Watering Volume

30 cm

Lamp Distance

Nutrients 2

DryPart Bloom

0.8 mll

Pro Bloom

0.2 mll

valiotoro Week 7 hehe everything’s on point buds are stacking nicely and the terps are coming through super loud! Temps are pushing the limit a bit, but I’ve never used AC and I’m definitely not about to start now 😂

29 likes

4 comments

Happy Harvest Day!

Amnesia Z Auto Fast Buds

10/10

Rated

Stay Here 4 Life Damn, the finish is incredible!! The goal of this run was to test the best light schedule for autos, and from my point of view, 20/4 is more than enough! (Maybe 24/0 with CO₂ supplementation could be worth it.) With 20/4, the plant gets a bit of time to recover, and she won’t hold a couple of small mistakes against you. The last few weeks I had temperatures above 30°C in the tent, but they handled it really well. If you’re looking for a great sativa with an amazing cerebral high and candy-like terps, this is THE strain to choose.

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Spent 51 days

Ger Veg Flo Har

870 g

Bud wet weight per plant

Plants

3.81 m²

Grow Room size

Easy

Difficulty

Height

Day air temperature