Cost per mole photons for four capture assumptions.

z- See Table S1 for a list of fixture manufacturers and model numbers.
y-The number of fixtures to get 1 millimol (1000 µmol) of photons per second.
x-Cost of fixture (multiplied by fixtures needed) plus cost of electricity over 5 years. We used a discounted cash flow model assuming a 5% per year cost of capital. Installation and maintenance costs were assumed to be similar for all lamp types and were not included in this calculation.