Zowahh Stems turned purple

Zowahh strain(cuttings) 4 weeks in veg. Growing under full spectrum LED'S
CE 1 4 1.6 PH 6.0 6.2 RH 60 70 Temp. 28 24
Intensity of the light spectrum added in the picture.
I thought it could be a temperature too low some growers advice to keep 26-30 if growing under LED'S
Some plants looks more purple than the others. Is light to intense or it's a nature of the strain to turn purple?
I thought it could be
Please advice
 

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