so far there is nothing serous to see - i can't tell what color the leaves have do to the HPS and you shooting without a flash - but besides that you seem to be lucky still, no visible burns to see in those pics.

from now one feed em water you just pH to 6.5 and no fertilizers for the next 2 weeks and this should be fine.

besides, i would veg with less power - a few tubes or CFLs will do the job just fine and use less hydro money up. also are normal HPS bulbs in the wrong side of light spec/color temp to veg with - you need more blue light then red as it holds more energy which your plants need right now. get a few 6500K/cool light CFLs or a set of tubes, doesn't cost much but safe some hassle you can have with vegging under a HPS.

Just watch that you keep those close to the light if you switch to floro tubes/CFLs - 2 inches are a good distance but it shouldn't be much more or they start to stretch, min is about an inch. and watch out because CFLs get hotter then tubes - don't let a plant touch a CFL bulb!

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Keep the gun oiled and the thumb green!