Abstract: Embodiments described herein relate generally to continuous flow photoreactors with easily replaceable and adjustable components. The photoreactor includes a reactor flow system, a lighting system, and a temperature control system. The reactor flow system includes a reactor inlet port, a reactor outlet port, and a length of reactor tubing fluidically coupled to the reactor inlet port and reactor outlet port. The lighting system includes a light emitting apparatus (e.g., a plurality of LEDs) configured to emit light in a defined wavelength range toward the length of reactor tubing. The temperature control system includes an inlet port, an outlet port, and a length of temperature control tubing fluidically coupled to the inlet port and the outlet port. In some embodiments, the temperature control system can be configured to circulate a fluid to cool the lighting system.