light leak concern with new veg tent in same room as flower closet.

Ok I built a new tent in the same room as my flower closet. I just up graded to a 400 watt HPS from HTG suppy ( Lovin it BTW ). The veg tent is five ply blue tarp, with a 36" tower fan on its side along the back. Tell me what y'all think. IMG_20120925_134602.jpgIMG_20120925_134705.jpgIMG_20120925_134720.jpgIMG_20120925_135119.jpgIMG_20120925_134841.jpg
 
Now I know the pics aren't the best but guys, is that to much light. The doors to the flower closet is slated and half covered in mylar. I just really really don't want any hermis. Any help or opinions is more then welcome.
 
The pics are with the HPS on with the closet shut. What I'm mainly worried about is the fact that is blue. A light green glow woundnt make me worrie. Just that's its blue.
 
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