G9 capsules target mains fittings where halogen once lived. Bodies range from ultra-compact silicone sleeves to glass or ceramic cores with opal jackets. Typical nodes: 2.5/3/4.5/5 W delivering about 200/300/420/500 lm with near-omni distribution (~270–320°). Colour packs 2700/3000/4000 K; CRI 80 is standard, with CRI 90 (often R9 > 50) stocked for wood, fabrics, and food tones. Operating window usually −20…+40 °C; hold Tc ≤ 85 °C—tight shades or insulation against the crown will shorten life and nudge colour.
Glass “mini capsule” styles keep the classic look for visible fixtures; silicone compacts squeeze into tiny chimneys; ceramic-core/opal sleeves run cooler and read softer in mirrors and bedside heads. Beam is quasi-omni; forward bias appears on taller opal sleeves that sit deep in the holder. Binning on project lots stays within ≤3 SDCM so rows don’t drift across phases.
These are 220–240 V self-ballasted capsules. Trailing-edge (RC) dimmers are the safe pick; many SKUs list tested leading-edge (RL) channels. Expect ~5–100% on clear glass and ~10–100% on opal when the channel load sits in the dimmer’s stable window. Professional batches target PF ≥ 0.90 from ~4–5 W upward, THD ≤ 15 %, and low modulation light (PstLM ≤ 1.0, SVM ≤ 0.4) for camera-heavy rooms. Very light loads on multi-gang plates can shimmer—aggregate or add the specified bleed.
Clear glass capsules give point-source sparkle in crystal arms and open sconces. Opal jackets calm luminance in close sightlines and glass chimneys. Tints (amber/smoke) exist for period ambience; choose CRI 90 at 2700 K when faces, timber, and food are in the scene. For compact metal shades, short-body capsules keep the lamp below the cut edge so the source isn’t directly visible.
Overall length matters: LED G9s are often taller than legacy halogen. Common envelopes sit ~45–60 mm tall; check shade depth and cage clearance. Use heat-rated lampholders (≥T150) in enclosed cups; keep fabric and foam away from the crown. In metalware, add insulating washers to maintain creepage/clearance to live parts.
Safety/marking: IEC/EN 62560. LED source/driver: EN 62031, IEC 62384, EN/IEC 61347-2-13. EMC: EN 55015/EN 61547. Mains quality: EN 61000-3-2/-3-3. Photobiological safety: EN 62471 RG0/RG1 on typical outputs. Labels print lm/CCT/CRI/PF/THD/dimming icon and envelope size so store teams pull the right carton.
Pick like this:
Lamp-only swaps keep trims and shades. Mirror the tender phrase on labels but pin envelope height, lumen class, CCT/CRI, and dimmer type on the same line. Where estates mix caps, tag plates clearly so G9 sockets aren’t cross-filled with other formats during maintenance.