I'm growing 5 plants, (Kaya Gold, feminized), under a 400w HPS light (I know the MH ones are better for vegging - next time), in a closet (with anti-detection countermeasures taken). Have been topping the plants, and recently did some rudimentary LST (this grow i'm more trying to get an idea of how the plant grows, advanced techniques next grow). I planted them in the first week of april, and transplanted them from small pots to the ones they're in now last weekend. Early in their life, they were somewhat heat stressed, but that's been dealt with by improving the ventilation and changing the position of the light. Been on 18/6 light cycle since the second week (first week was 24 hour, and a weaker light). Several of the plants are beginning to show sex characteristics. One of them (number 5), was always more vigorous, and pistils were visible weeks ago, and now 3 of them (1, 2, 5) are showing them. My question is, when should i switch the light cycle to begin flowering? Thanks I've attached photos of the plants - apologies for the sub-standard pictures (cellphone camera). I wasn't able to make it take a decent picture where you could see the pistils.