im knew to do this, but what is 12/12?

im very new to do this, im just surfing to learn a few things, would anyone happen to knw what 12/12, plz be kind enough to leave a feedback

moving from a photo period of 18-24 hours and switching to 12-12 to induce flowering.

What he said

thanks, im guessing its only for indoor... so i wouldnt need it

not likely. flowering happens outside after the solstice i do believe.

Which is on June 21. The longest day of the year(sunlight). First day of summer. Then the days gradually get shorter.