LED Light Source Recent advances in light emitting diodes have led to a number or previously unavailable wavelengths, including higher energy UV LEDs for Fura-2 illumination. We're proud to offer advanced LEDs offering excitation light for most common fluorophores. These LEDs feature closed-loop feedback control for stable intensity as well as protective overload circuitry to prevent LED damage. Wavelength switching is practically instantaneous and can be continuously alternated [...]