# Light cycle For plants **URL:** \ **Category:** Autoflowers\ **Created:** [August 19, 2022, 5:39pm UTC](https://ilgmforum.com/t/light-cycle-for-plants/92031 "2022-08-19T17:39:56Z")\ **Posts on this page:** 9\ **Page:** 1
**Author:** ![Jason12](https://avatars.discourse-cdn.com/v4/letter/j/c77e96/32.png) [@Jason12](https://ilgmforum.com/u/Jason12)\ **Post date:** [August 19, 2022, 5:39pm UTC](https://ilgmforum.com/t/light-cycle-for-plants/92031/1 "2022-08-19T17:39:56Z")
Gday all have a quick question can u change light cycle from 12 to 18 hours of light I have a couple of one’s flowering and have had to put seedlings with them the ones in flower have been for 3 weeks on a 12 hour cycle seedlings on 18 new to indoor Any advice will be greatly appreciated ---
**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:** [August 19, 2022, 5:41pm UTC](https://ilgmforum.com/t/light-cycle-for-plants/92031/2 "2022-08-19T17:41:35Z")
It doesn’t matter a whole lot if they are all autos, which don’t care about the light cycle. If you want to change the light cycle, do it at your will. The plants won’t know the difference. Welcome to the forum. ---
**Author:** ![Jason12](https://avatars.discourse-cdn.com/v4/letter/j/c77e96/32.png) [@Jason12](https://ilgmforum.com/u/Jason12)\ **Post date:** [August 19, 2022, 6:35pm UTC](https://ilgmforum.com/t/light-cycle-for-plants/92031/3 "2022-08-19T18:35:19Z")
Thanks for the quick replythe two in flower r photos does that make a difference the rest r autos ---
**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:** [August 19, 2022, 6:38pm UTC](https://ilgmforum.com/t/light-cycle-for-plants/92031/4 "2022-08-19T18:38:32Z")
You need to stay with 12 hours if you have photos. An 18 hour cycle with photos will cause them to stop flowering and reveg. ---
**Author:** ![Jason12](https://avatars.discourse-cdn.com/v4/letter/j/c77e96/32.png) [@Jason12](https://ilgmforum.com/u/Jason12)\ **Post date:** [August 19, 2022, 6:39pm UTC](https://ilgmforum.com/t/light-cycle-for-plants/92031/5 "2022-08-19T18:39:49Z")
OK thanks ---
**Author:** ![HMGRWN](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/hmgrwn/32/632189_2.png) [@HMGRWN](https://ilgmforum.com/u/HMGRWN)\ **Post date:** [August 19, 2022, 6:40pm UTC](https://ilgmforum.com/t/light-cycle-for-plants/92031/6 "2022-08-19T18:40:33Z")
Your auto seedlings will do fine with 12 hrs of light. ---
**Author:** ![Jason12](https://avatars.discourse-cdn.com/v4/letter/j/c77e96/32.png) [@Jason12](https://ilgmforum.com/u/Jason12)\ **Post date:** [August 19, 2022, 6:41pm UTC](https://ilgmforum.com/t/light-cycle-for-plants/92031/7 "2022-08-19T18:41:25Z")
That’s great to know thanks ---
**Author:** ![Dexterado](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/dexterado/32/678065_2.png) [@Dexterado](https://ilgmforum.com/u/Dexterado)\ **Post date:** [August 19, 2022, 6:50pm UTC](https://ilgmforum.com/t/light-cycle-for-plants/92031/8 "2022-08-19T18:50:12Z")
Agree with above, you do not want to change light to 18 on the flowering photos. I had one reveg once, and what a mess. And in case you don’t already know, make sure you have absolutely no light leaks during lights out. ---
**Author:** ![Jason12](https://avatars.discourse-cdn.com/v4/letter/j/c77e96/32.png) [@Jason12](https://ilgmforum.com/u/Jason12)\ **Post date:** [August 19, 2022, 6:54pm UTC](https://ilgmforum.com/t/light-cycle-for-plants/92031/9 "2022-08-19T18:54:28Z")
OK thanks