A traditional full-spectrum xenon lamp approximates the sun, but in experiments that want "only one wavelength" it is redundant: the unwanted bands heat the sample and trigger side reactions. An LED source is inherently narrow-band—nearly all its energy lands on the target wavelength—and it is long-lived, low-heat, and precisely dimmable. That is why monochromatic light sources are spreading rapidly through photochemistry.
Perfectlight's PLS-LED 100C and similar LED sources are designed exactly for this kind of monochromatic excitation.
When research needs to "sweep wavelengths" without swapping many LEDs, a tunable light source (such as the PLS-LED-LC1000 tunable LED system) covers a wavelength range within one device, greatly improving scanning efficiency. It is especially suited to spectral-response curves and band-gap-related mechanism studies.
The best practice is usually a "one-two punch": use a xenon lamp / solar simulator for full-spectrum validation, and a monochromatic LED source for mechanism deconstruction. The two complement each other—keeping data "sun-like" while also answering "which wavelength is actually doing the work."
Contact Perfectlight: Want to do wavelength scanning with a monochromatic or tunable LED source? Tell us your target band and irradiance, and Perfectlight will configure the LED source and modulation scheme for you.
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AQY, action spectra, and selective excitation—any mechanism study needing a single wavelength or wavelength scanning.
A fixed LED has one wavelength; a tunable source sweeps wavelengths within one device, ideal for spectral-response curves and band-gap mechanism studies.
For monochromatic or scanning work it can and is often better; but full-spectrum sun-like validation still needs xenon or a solar simulator. They are best used together.
This article does not constitute a performance commitment; specific technical parameters are subject to the actual product documentation and mutual confirmation.
