5mm LED Bulk Buying Guide: Specs That Prevent Costly Mistakes
Quick answer: bulk 5mm LED orders go wrong on unspecified details — wavelength, brightness bin, viewing angle, lens type, lead length and packaging. Fix all six in writing and approve samples before volume.
The Six Specs
- Color: dominant wavelength range, or CCT + bin for white.
- Brightness: mcd bin at a stated test current (usually 20 mA).
- Viewing angle: 15°, 30°, 60° or diffused wide-angle — this changes perceived brightness dramatically.
- Lens: water-clear vs diffused; straw-hat and flat-top shapes change the angle.
- Leads: standard ~26 mm, or specify cut/formed leads for your assembly.
- Packaging: bulk bags vs ammo pack; ESD-safe packing for sensitive bins.
Volume Pricing Logic
Price breaks come at reel/bag multiples and order volume, but the cheapest quote often hides lower chip grades or copper wire. Ask explicitly: chip grade, wire material (gold vs copper-alloy), and epoxy quality.
Incoming Inspection
On first lots: sample-test Vf and brightness with a constant-current source, check lead solderability, and compare against the approved golden sample.
Hongcheng Optoelectronics, a member of Guangyu Group, is a 20+ years LED packaging manufacturer with 40 automated ASM lines and 200KK pcs monthly capacity. Free samples and PDF datasheets are available in our datasheet center; browse the product center or contact us for a bulk quote. Our through-hole LED series covers 2mm to 10mm with round, straw-hat, flat-top and bi-color options.
