Generating certified randomness based on measurements on entangled physical systems is a topic of strong recent interest, and one of the practical applications of the detection-loophole free Bell tests. So far, experiments in this field have been carried out with event-ready preparations of quantum systems by (lossy) heralding schemes for atoms and color centers, or by using pulsed pumps in parametric down conversion. Here, we measure correlations from a continuous light source, and use measurement outcomes for a Bell test not in a traditional spin-1/2 picture. With this, we derive certified randomness at unprecedented rates in a conceptually simple way.