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Shining a Light on Microscopy: Choosing the Right Widefield Light Source with Excelitas X-Cite LED

Microscopy is a fascinating field of study that has revolutionized the way we perceive the world around us. Whether you are a biologist, a chemist, or a material scientist, having access to the right tools is essential for getting accurate and reliable data. One of the most critical components of a microscopy setup is the light source, which provides the necessary illumination for imaging.

Choosing the right light source for your microscopy setup can be a daunting task, especially given the variety of options available. In this article, we will take a closer look at widefield light sources and how to choose the right one for your imaging needs. We will also focus on Excelitas X-Cite LED light sources and how they can enhance your fluorescence imaging.

What is a Widefield Light Source?

A widefield light source is a type of illumination system that provides a uniform and broad area of light to illuminate the sample in microscopy. This type of light source is particularly useful for fluorescence microscopy, where it is important to excite the fluorophores in the sample to emit light. The widefield illumination ensures that the entire sample is evenly illuminated, providing optimal conditions for imaging.

When choosing a widefield light source, there are several factors to consider, including:

1. Spectral Range: The spectral range of the light source should match the excitation spectrum of the fluorophores being used. This ensures that the fluorophores are optimally excited, resulting in better imaging.

2. Intensity: The intensity of the light source should be high enough to excite the fluorophores, but not so high as to cause photobleaching or phototoxicity.

3. Stability: The stability of the light source is important for consistent and reproducible results. Any fluctuations in the light source can lead to variability in the imaging data.

4. Lifetime: The lifetime of the light source is also an important consideration. Light sources with longer lifetimes require less frequent replacement, reducing downtime and costs.

Excelitas X-Cite LED Light Sources

Excelitas X-Cite LED light sources are among the most popular widefield light sources available today. They offer several advantages over traditional mercury or metal halide lamps, including:

1. Spectral range: X-Cite LED light sources cover a broad spectral range, from UV to NIR, allowing for the excitation of a wide variety of fluorophores.

2. Intensity: X-Cite LED light sources are highly efficient and provide high-intensity illumination, making them ideal for imaging low-abundance samples.

3. Stability: X-Cite LED light sources are highly stable, with minimal fluctuations, ensuring consistent and reproducible imaging data.

4. Lifetime: X-Cite LED light sources have long lifetimes, up to 25,000 hours, reducing downtime and costs associated with lamp replacement.

5. Versatility: X-Cite LED light sources are versatile and can be used with a variety of microscopy techniques, including brightfield, darkfield, phase contrast, and fluorescence microscopy.


Choosing the right widefield light source is essential for getting accurate and reliable imaging data in microscopy. Factors such as spectral range, intensity, stability, and lifetime should be considered when selecting a light source. Excelitas X-Cite LED light sources offer several advantages over traditional light sources, including a broad spectral range, high intensity, stability, long lifetime, and versatility. By choosing the right light source for your microscopy setup, you can achieve optimal imaging conditions and obtain the best possible data. Visit for more information on the complete range of X-Cite LED light sources.

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