my grow first timer

hey guys,
ive started to grow 4 snow white .i have germinated them and planted them in 2/3 soil 1/4 perlit under a 400 watt hps lamp on a 18/6 lighting cycle.my tempature durin the light is 19 degrees average(celcius) and 10 degrees when light is off.the humidity ranges from 40-50%.my babies have sprouted and there about 2 inches high.im sprayin the plants every now and again.they seem happy!is my hgumidity alright?and are my tempatures alright?any help or comments would help alot.tanx a million!!:wall::leaf::leaf:
 
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