Light sources and ballasts for microscopy

Microscopy is an indispensable part of science, medicine and industry. To achieve the best results, the right choice of lighting is crucial for every application.

Precise illumination. Reproducible results. Reliable application

In microscopy, illumination determines the contrast, signal quality and reproducibility of your measurements. LEJ offers a portfolio of illumination solutions in the UV to VIS range – from compact LED solutions as a halogen replacement to ultra-fast multi-channel systems for the most demanding applications.

In short: If you are looking for a microscope light source that is stable, integrable and serviceable, you have come to the right place.

Application in microscopy

Are you examining tiny components or researching the smallest structures and need a powerful and reliable light source? We support you from product selection to integration into your system – including adapters, light guides and service.

Typical requirements that we cover

Products in microscopy

LED FLUO

Highly compact, ready-to-use high-performance LED fluorescence light source, wavelength range from 410 to 650 nm (BFP-Cy5)

LQ-LED 8

8-channel LED fiber light source for kerr microscopy, with freely selectable channels

LED NANO

Highly compact, high-performance LED VIS light source

LED MULTILUX

8-channel LED fluorescence light source – simultaneous and separate control with switching times from 1 μs

EB Series 04

Electronic ballast for Hg, Xe and mixed gas discharge lamps up to 100 W

LED MAGNA

Compact, high-performance, 2-channel LED fluorescence light source, ready to use, triggerable up to 100 kHz

LED PICO

Compact LED light source for a wide range of applications – from UV-A to VIS

LH LED 100

1-channel VIS LED light source for microscopy

LQ-HXP 120

120 W mercury AC short arc reflector lamp for fluorescence applications in microscopy

Suitable accessories

Do you need accessories? Of course, we offer a wide range of accessories for our products. Whether light guides, replacement lamps, microscope adapters or others.

Microscope light sources from compact to high-speed

Compact & direct: LED as a halogen replacement

For many applications, an LED light source in your microscope is the practical choice: durable, efficient, easy to control – ideal for routine work and upgrading existing systems.

Examples from the portfolio:

Multichannel for sophisticated fluorescence & multispectral

When it comes to fast channel changes, synchronous control and defined excitation, multi-channel systems have the advantage.

Cold light sources, light guides & coupling to the microscope

Depending on the product and setup, coupling takes place directly on the stand or via a light guide. We also offer suitable microscope adapters, light guides and replacement illuminants.

If you are specifically looking for a cold light source for your microscope: The decisive factor is whether you need to keep heat strictly away from the sample or whether direct coupling (compact, mechanically simple) is more suitable.

Electronic ballasts & power supply: stability is image quality

Microscopic systems (lighting, camera, drives) require a stable power supply. Fluctuations have a direct effect on brightness, contrast and measurement quality – especially in automated sequences.

In addition to LED systems, LEJ also supplies mercury AC short arc lamps and electronic ballasts (including for Hg, Xe and mixed gas discharge lamps).

Microscopy illumination

Illumination is one of the most important components in microscopy, as it has a direct influence on image quality and the visibility of details. Different microscopy techniques, such as light microscopy, fluorescence microscopy and darkfield microscopy, require different illumination solutions to achieve the best results.

High-quality light sources

High-quality light sources are essential for precise and detailed imaging. In classic light microscopy, a halogen or LED lamp is often used to ensure uniform illumination. In fluorescence microscopy, specially tuned UV light sources or LEDs are used to excite fluorophores and provide high-resolution images.

Customizable lighting

Adjustable illumination is essential to achieve the correct brightness and contrast settings. The illumination must be adjusted to the specific sample and microscopy mode. Some microscopes offer advanced control systems that allow the light intensity and angle of illumination to be adjusted to achieve the best possible results.

Lighting technologies for special applications

In dark-field microscopy or phase-contrast microscopy, special illumination techniques are used to visualize thin samples or cells. These techniques require precise light control to maximize the contrast and detail of the sample without overexposure or scattering.

Power supply

The power supply is also a critical factor in microscopy, as microscopes and their accessories must be constantly supplied with power to ensure their functionality and precision. A stable and reliable power source helps to ensure that microscopy analyses can be carried out without interruptions and with maximum accuracy.

Stability of the power supply

Microscopic devices, in particular digital cameras, LED illumination units and special drives, require a stable power supply. Fluctuations in voltage or power failures can impair the performance of microscopes and lead to faulty images. A constant and regulated power supply ensures trouble-free operation and precise measurements.

Redundancy and emergency power supply

In highly specialized fields such as medical microscopy or research, it is important that microscopes continue to work reliably even in the event of a power failure. Redundant power supplies or uninterruptible power supplies (UPS) guarantee that the microscope can continue to operate even in the event of a sudden failure without losing valuable data.

Energy efficiency

Microscopes and their illumination units regularly require a constant supply of energy. By using energy-efficient LEDs and modern power supply systems, energy consumption can be reduced, which not only helps to reduce operating costs but also extends the service life of the devices.

FAQ - Light sources & ballasts

What is light microscopy?

Light microscopy uses visible light (and, depending on the method, also UV components) to image fine structures. The illumination has a decisive influence on contrast and detail recognition.

Which light source for the transmitted light microscope?

What counts for transmitted light is homogeneous, stable illumination and fine controllability – so that specimens can be documented in a comparable way.

Fluorescence microscopy light source - what to look out for?

Defined excitation, fast switching times and trigger capability are important – especially for time series and automated measurement sequences.

UV microscopy / UV microscope / UV light microscope - is it possible with LED?

Yes, depending on the setup: UV/VIS LED systems cover typical excitation ranges and can be precisely controlled.

"uv microscope" - what does that mean?

This is usually the English search variant for UV microscope or UV microscopy.

Electronic microscopes - is that the same as light microscopy?

Many people use the term “electron microscopes”. These do not work with a classic light source like a light microscope. If you are unsure, briefly tell us your application – we will narrow it down for you.

Light source Light microscope / Light sources Microscope / Microscope light sources - how do I find the right one?

Start with the method (transmitted light, fluorescence, UV), required intensity, switching requirements (trigger/Hz) and mechanical integration (stand vs. light guide) – we will be happy to advise you.