Athosanswered grow question 6 years ago I looked to your past weeks. You have a problem with light intensity, most likely because you have the light too far away; there's no point in using a 400 watt light at 120cm, 60cm or 40cm. You would do much better with a lower powered light at a much closer distance. If you can manage to get the light closer, like 20cm to 30cm (taking care not to cook the plants) then you will see much better results. Either with a cooltube or using a light that does not generate the amount of heat that a 400 HPS do. Consider vegging with something like LED bulbs, like I do; hell I'm using 63 watts (which barely generate heat), allowing me to place the lights between 5cm and 15cm from the plant; achieving much better results, at much lower electricity used.