KHAN..

Are you going just on numbers or do your plants look bad?
Humidity can be a serious problem... the plant can grow in a very dry climate.. but the opposite . a lot of humidity can cause all sorts of problems... make sure you have good air flow if you are going to raise your humidity... especially if you are going to use a humidifier

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If you are using HID.... a bucket of water near the light should raise the humidity... more than enough in a closest size room...

: )