There is no strict time to look like the light of the outcome of my case 18 hours a day can keep the light, but not according to what you talked about 24 / 0 or 22 / 2 or 20 / 4 or 18 / 6, the work of such will affect the growth of seedlings do?
How To Use Progressive Web App aka PWA On 420 Magazine Forum
Note: This feature may not be available in some browsers.