Junk
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Quick question. I have a bunch of two week old seedlings, woukd I be okay to put my 400 watt hps above them in a 3×3×5 tent? I have a fan on light helping cool and a fan blowing cool air in from outside. I also have the window open in the room and it's like 30 degrees outside. So would I burn them or will they appreciate the extra light??? In another day I'll have another fan for in there in just waiting on it.
If you plan to veg, I'd do like Laz said & pick up an MH bulb. You don't want to veg under an HPS, if you can help it anyway @Tnelz mentioned to me one time you can get them at Home Depot for $29 if i recall correctly (what I paid). That is, if your ballast does both.
You should have a hygrometer though mounted/hanging at canopy height...to know if you are burning the plants or not. All your temp information & venting doesn't help if we don't know the tent/canopy temp. If you are in cold weather where you are at you should be fine. Hang the light as high as possible at first & lower it as they plants adjust. If in veg it should only be a few days.