The soluble sugar, soluble protein, and starch contents in potato plantlets in vitro were significantly higher in all of the LED treatments than under FL (Fig. 3). The addition of G promoted the accumulation of carbohydrates and proteins. The highest soluble sugar, starch and soluble protein contents were observed in the R660BG treatments; a result suggesting the combined spectrum Fig containing R660 enhanced the accumulation of carbohydrates and proteins more than R630in potato plantlets in vitro