Purple and a little brown on the tips of a few leafs HELP!:(

E.T

Active Member
If anyone could quickly help me, i have posted a pic up of my plant a few weeks ago and you all said it was looking good. Now i have put the 600W HPS on it and its starting to go purple its very purple on the top 2 branches down the leaf vains and on a few below. Its also drooping a fair bit and havs a frew dark and light green leavs and it also has purple lines up the whole stem of it. What could cause this its not becase its to cold as its at 24c and im only using nutes every two days:cry::cry:
 
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