Light Emitting Diode (LED) Sources for OEM and Lab Use
Frequently Asked Questions
What is a light emitting diode (LED) and how does it generate incoherent light?
A light emitting diode (LED) is a semiconductor p-n junction that emits photons when forward biased, via radiative recombination of electrons and holes in the active region. The emission is spectrally narrow compared to thermal sources but still incoherent, with typical full width at half maximum (FWHM) of 15–50 nm depending on the material system and device design.
What are the main semiconductor materials and wavelength ranges available for LEDs?
LEDs commonly use GaN/InGaN for near-UV to blue and green (≈365–550 nm), AlInGaP for red to amber (≈590–660 nm), and AlGaAs/InGaAlP for deep red and near-IR (≈660–900 nm). For longer wavelengths into the short-wave IR (SWIR, ≈1.0–1.7 µm), materials such as InGaAsP and InGaAs on InP substrates are used, though with different efficiency and thermal characteristics than visible LEDs.
What are the main LED package and structural variants, and how do they differ in performance?
Common variants include through-hole (THT) LEDs, surface-mount devices (SMD), high-power LEDs on metal-core PCBs, chip-on-board (COB) arrays, and fiber-coupled LEDs. High-power and COB devices support higher drive currents and flux but require robust thermal management, while fiber-coupled LEDs integrate optics to efficiently inject light into multimode fibers, trading some total output power for improved coupling and spatial delivery.
Which key specifications should I consider when selecting an LED for a scientific or industrial setup?
Important parameters include peak and centroid wavelength, spectral FWHM, radiant flux or optical power, viewing or emission angle, forward voltage, and maximum continuous and pulsed drive currents. For precision applications you should also review center wavelength tolerance, wavelength shift with temperature and current, thermal resistance (junction-to-case), and if relevant, spatial intensity profile and polarization (usually unpolarized for standard LEDs).
How do I compare LEDs for coupling into optical systems such as fibers or imaging setups?
For fiber coupling, match the LED’s emission area and divergence with the numerical aperture (NA) and core size of your fiber, and consider using LEDs specifically designed with integrated lenses or fiber receptacles. For imaging or illumination, evaluate the emission pattern, irradiance at the working distance, and compatibility with your collection optics (e.g., condenser NA, f/#), as well as mechanical form factor and heat-sinking options for integration into your optomechanical layout.
What practical factors affect LED pricing, lead times, and customization options for B2B orders?
Pricing is driven by wavelength (especially UV and SWIR), optical power level, binning tolerances (wavelength and flux bins), package type, and any integrated optics or drivers. Lead times can vary from stock shipment to several weeks for tightly binned, custom-binned, or custom-packaged LEDs, and suppliers often offer options such as specific center wavelengths, custom PCB layouts, pre-mounted heat sinks, or pre-aligned fiber coupling for volume orders.
Engineered Light Emitting Diode (LED) Sources
The Light Emitting Diode (LED) products in this category provide incoherent, solid-state light sources for illumination, sensing, test, and measurement. Engineers and scientists can source single emitters, integrated assemblies, and characterization tools tailored to OEM integration and R&D environments.
Available Light Emitting Diode (LED) Sub-Types
Integrated LED Modules combine Light Emitting Diode (LED) chips with drivers, optics, and thermal management on a single platform. These are suited for turnkey integration into instruments, machine vision systems, and analytical equipment.
Tri-Proof LED luminaires are sealed, dustproof, waterproof, and often corrosion resistant. They are used in harsh industrial environments, cleanrooms, and utility spaces requiring robust Light Emitting Diode (LED) illumination.
LED Arrays group multiple emitters on a common substrate to deliver higher radiant flux or tailored spatial profiles. These arrays support applications such as UV curing, fluorescence excitation, and structured illumination.
Surface Mounted Device LEDs (SMD) are compact Light Emitting Diode (LED) packages for PCB assembly. They enable dense layouts, automated pick-and-place manufacturing, and precise optical alignment in compact instruments.
TO Package LED devices use transistor-outline cans for enhanced mechanical robustness, defined pinout, and improved thermal conduction. They are common in sensing, fiber coupling, and reference light sources.
Superluminescent Diodes (SLED) combine LED-like spatial coherence with broadened spectra. These Light Emitting Diode (LED) style sources are used in optical coherence tomography, fiber gyros, and low-coherence interferometry.
LED Test & Measurement tools support characterization of Light Emitting Diode (LED) performance, including optical power, spectral output, forward voltage, and reliability under varying drive conditions.
Buyer Guidance
When selecting a Light Emitting Diode (LED) product, compare peak wavelength or spectral bandwidth, radiant flux or luminous flux, viewing angle or numerical aperture, and junction temperature limits. Evaluate package type, footprint, and mounting style relative to your mechanical design. For SLEDs, pay close attention to center wavelength, FWHM, polarization, and fiber-coupling configuration.
On FindLight you can review detailed datasheets, compare multiple Light Emitting Diode (LED) options side by side, and request quotations directly from suppliers. No registration is required to access specifications, making it straightforward to shortlist components for design, prototyping, or production sourcing.