Effect of Different Light Intensities on Total Phenolics and Flavonoids Synthesis and Anti-oxidant Activities in Young Ginger Varieties (Zingiber officinale Roscoe) oleh Ali Ghasemzadeh, Hawa Z. E. Jaafar, Asmah Rahmat, Puteri Edaroyati Megat Wahab, Mohd Ridzwan Abd Halim