To determine the effects of blue spectrum supplemental lighting on flower bud formation and stem elongation of cut chrysanthemum ‘Zembla’ cultivar. The study were 42 days under 4 different light treatments. Treatments comprised
1. RB is red and blue mixture LED in 11 hours.
2. RB + B is red and blue mixture LED in 11 hours and blue LED in 4 hours.
3. LRB + B is red and blue mixture LED in 4 hours and blue LED in 15 hours.
4. RB + LB red and blue mixture LED in 13 hours and blue LED in 11 hours.