too little colour in leaves

[pippen]

hello, i gots a little problem,

i use soil, with perlite units init, from the local growshop
i buildd a room box about 1x1m en 1,30 high, indo
i got snowwhite
i bought them as little babies, they now 1 week in the box
400w natrium lamp, dont know in english
about 60 cm / 2 ft(?) up
the growshop told me i dont need to feed them extra for the first weeks except the rootstimulator

the ground is buffered, so Ph its problably ight
+-23 celcius, +-55% humidity
20 to 25 cm pots im not sure,
NO bugs or beasts or fuckers
. i got sum pictures bu i dontknow how to place them,.
MY problem: the leaves are a little light. not yellow but light green..
o jeah i see how to place pics
pc272 is from a few days ago, allt he others i made just now.
ou can see on pic278 bottom right a nice strong colour, and the upper leaves are in my eyes a little to light
im a first timer btw so eaze

oojea i forgot some leaves curl a little too! ou can see it best @ 2nd pic

[SmknVTEC]

We need natural light pics to see.

[pippen]

ok ima try dat when im off work