This Underground Lighting collection focuses exclusively on the PSX26W bulb, an OEM halogen to LED fog light bulb replacement used in factory fog lamp systems across Toyota, Ford, Subaru, Honda, Hyundai, and other vehicles. The PSX26W format is defined by its PG18.5d-3 plastic base with two wide horizontal locking tabs, which determine socket compatibility and prevent installation into unrelated formats such as H11 or 880/881. Because of this unique keyed base geometry, PSX26W bulbs are not interchangeable with H-series or round-base fog bulbs.
The category centres on the PSX26W LED replacement bulb, a solid-state upgrade that replaces the original 26W halogen filament bulb with LED emitters positioned to replicate the filament location (1:1 optical alignment). Maintaining this filament-equivalent geometry is critical for fog-lamp beam pattern integrity, ensuring the wide, low beam dispersion required for fog, rain, and snow visibility without creating glare or hotspotting.
This collection includes two PSX26W LED product types:
- PSX26W / PY13W 650LM Plasma White LED Bulbs (Pair)
Compact LED replacements producing approximately 650 lumens at 6000K white, designed for OEM reflector or projector fog housings where space is limited and thermal load must remain low.
- PSX26W / PY13W 40W 6000LM LED Fog Light Kit (Pair)
High-output LED fog light kit delivering up to ~6000 lumens per pair at 40W, engineered for vehicles with larger fog housings and enhanced brightness requirements.
All PSX26W LED bulbs operate on standard 12V automotive electrical systems and install via plug-and-play twist-lock insertion into the factory fog socket. Because LED bulbs draw significantly less current (~8–12W vs 26W halogen), some vehicles may detect reduced load and trigger bulb-out warnings, which are mitigated using CANbus-ready circuitry or external decoders when required.
PSX26W LED bulbs are designed for reflector or projector fog lamp housings, where beam pattern and glare control are governed by the housing optics. Color temperature selection influences fog performance:
- 6000K white: modern appearance and high contrast in clear weather
- 3000K yellow (variant type): improved penetration in fog/snow with reduced backscatter
Compared to halogen PSX26W bulbs (~4300K, ~800–1000 lumens), LED replacements provide 2–3× higher usable brightness, lower heat generation, and extended lifespan while preserving OEM fog-beam characteristics.
This PSX26W LED category supports OEM fog-bulb replacement and LED fog-light upgrades through Underground Lighting, emphasising correct base fitment, optical alignment, and CANbus stability. Discover our reverse & brake, turn signal lights, and switchback turn signal lights and confirm compatibility for your vehicle using the Bulb Finder tool.
