How can I design an inquiry-based photosynthesis lab testing light wavelength or bic

[Avery90]

I'm a high school biology teacher trying to develop a more engaging lab on photosynthesis that moves beyond simply demonstrating oxygen production with elodea. I want my students to investigate how a specific variable, like light wavelength or bicarbonate concentration, affects the rate. For educators who have designed inquiry-based photosynthesis labs, what are some reliable, cost-effective setups and measurement techniques you've used that yield clear, quantitative data for students to analyze?