LED Diode Q&A

Part of ← News Related categories Lighting Q&A · Industry News · LED Academy · Company News Expert answers to common LED diode questions: forward voltage, current, binning, package types, failure modes and selection guidance from Queendom LED engineers.
Silver Tarnish on LED Leads: Causes and Prevention
12.10.2026

Sulfur-driven silver tarnish discolors LED leads and degrades solderability. Where the sulfur comes from, and [...]

Silicone vs Epoxy Encapsulation in LED Packages
12.10.2026

The two dominant LED encapsulant chemistries differ in thermal stability, hardness and cost. Here is [...]

Current Derating Curves: Reading the Safe Operating Area
11.10.2026

The derating curve on an LED datasheet tells you where the part lives and where [...]

Phosphor Conversion in White LEDs: How White Is Made
11.10.2026

No LED die emits white. A blue pump die plus phosphor chemistry produces it. Here [...]

Gold vs Copper Wire Bonding in LED Packages
10.10.2026

The bond wire inside an LED package carries current to the die and heat away [...]

Thermal Resistance in LED Packages: Reading the Datasheet
10.10.2026

Rth decides how hot the die runs for a given power. The symbol alone is [...]

Colorimetry Coordinates: x, y and u’v’ for LED Color
10.10.2026

Chromaticity is a pair of numbers on a diagram, not a single CCT. Here is [...]

Solder Voids Under SMD LED Pads: Causes and X-Ray Criteria
09.10.2026

A void under a thermal pad raises junction temperature before it shows on a functional [...]

ESD Damage in LED Chips: HBM Ratings and Handling Rules
09.10.2026

An ESD strike can leave a chip passing the incoming test and failing weeks later [...]

SDCM and MacAdam Ellipses: Measuring LED Color Consistency
09.10.2026

A 4000K label is a projection onto a locus, not a fixed color. SDCM counts [...]

LED Lens Yellowing: Silicone vs Epoxy Under Blue and UV Flux
08.10.2026

Encapsulation decides how long an LED keeps its colour. Epoxy yellows under short wavelength flux [...]

Reflow Soldering Profiles for SMD LEDs: Peak Temperature and Ramp
08.10.2026

An SMD LED survives reflow only if the profile respects four zones at once. Peak [...]

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