High light intensity increases light dependent reactions, more energy to excite e^- so more photophosphorylation; more ATP and NADPH production reduce GP to TP and phosphorylate TP to RuBP (low GP levels and high TP and RuBP levels)
At low light intensities, light dependent reactions stop; no ATP or NADPH production, so light independent reactions also stop (high GP and low TP and RuBP levels)
