There is no biochemical source of visible light. Creatures who produce light emit X-rays, and excrete He. They are doing Molecular Nuclear Fusion
1 H2O+TU+P → He2++O2-+L+X-ray+E2
Every organism on Earth does Molecular Nuclear Fusion – burning the turbulent flow of high pressure light into He, O+L(X-ray). Down to -20oC in Arctic fish. As their hearts beat, they do Molecular Nuclear Fusion.
So do you! No high temperatures, pressures and lasers.
A heavy rain storm does Molecular Nuclear Fusion – leading to eerie flash illumination. A potential of 5,000 V will start a partial steam plasma tracing down from the cloud tops to the ground.
As it touches down, we get the discharge of 100 amps of charge. And produce 5 tonnes of He gas, as the current travels back up to the clouds.
2 H2O+e-+TU → He++O2-+E2+X-ray
So every 3 minutes around the Earth, nature does nuclear fusion on Earth. Take note China!
Scaling down, a 50x1cm steam plasma tube will produce 1.2 MW of heat continuously – from 0.0035cc of regular water a year. A steam turbine will generate a constant 120 kW, for nearly free.
No CO2, not solid radioactive waste.
3 H++e- ->n0
4 16O2-+s n0 ->8H++10e-
5 H++r n0 ->E3+L+X-ray
A pulse of electricity at 2,000 V 0.001 amps will initialise the plasma, which self sustains at 4 atmospheres. No no Global Warming, and no hyper-toxic radioactive death.