Marsauto D2S HID Bulbs Pack of 2 — 6000K Cold White 35W Xenon, OEM Fit for RVs

Marsauto D2S HID bulbs are a pair of 35W, 6000K xenon replacement lamps engineered to deliver bright, crisp cold-white illumination for compatible HID headlight assemblies.

These D2S (85122 / 66240 / 66040 / 66240CBI / 85122C1) bulbs are built for OEM-style fit and quick installation in RV and automotive HID housings. They combine ultraviolet-resistant quartz glass, sealed xenon gas capsules, and precision electrodes for a consistent beam pattern and dependable runtime. With a plug-and-play design and rugged construction, they are intended as direct replacements so you can restore factory-style light output without modifying housings or ballasts.

How bright and what color temperature do these bulbs produce?

The Marsauto D2S bulbs produce a cold-white light rated at 6000K, offering a crisp, daylight-like appearance that improves contrast on dark roads. Output is characteristic of a 35W HID system—brighter than halogen while maintaining clear beam edges for cutoff-based housings.

• Color temperature: 6000K cold white for neutral daylight look.
• Power draw: 35 watts per bulb, compatible with standard HID ballasts.
• Designed for clear, high-contrast illumination without color shifting.

Will these bulbs fit my RV or vehicle and how easy is installation?

These D2S bulbs match OEM dimensions and connector types so they plug into existing D2S HID assemblies without adapters. Installation is straightforward—no special tools are required when your vehicle uses D2S sockets and an appropriate ballast.

• Direct 1:1 replacement for D2S / 85122 / 66240 socket types.
• Plug-and-play: simply swap bulbs in compatible HID housings.
• Works with existing HID ballasts rated for 35W operation.

How durable are these bulbs and how long can I expect them to last?

Marsauto designs these xenon bulbs with UV-resistant quartz and sealed construction to minimize gas leakage and glass degradation. Under normal use they are specified for about 3,000 hours, and the housing and weld quality help resist vibration and road shocks—useful for RVs and rough-road vehicles.

• Estimated life: approximately 3,000 hours under typical conditions.
• UV-resistant quartz glass reduces yellowing and maintains clarity.
• Laser-welded construction improves shock and vibration resistance.

How quickly do the bulbs reach full brightness and are there beam quality concerns?

These D2S xenon lamps warm up to full output quickly—within seconds—thanks to precision electrodes and stable gas fill. They are made to produce smooth, even beams with minimal dark spots or irregularities when installed in properly aligned HID housings.

• Rapid warm-up: reaches near-full brightness in just a few seconds.
• Precision electrodes and capsule manufacturing reduce flicker and dark zones.
• Engineered for consistent beam pattern in compatible projectors and reflectors.

Who is this for: Drivers who need a factory-fit HID replacement for RVs, trucks, or cars with D2S assemblies and want a 6000K cold-white appearance without modifying headlamp housings. These bulbs suit owners replacing end-of-life xenon lamps, upgrading from aging halogens in compatible retrofits, or restoring consistent HID output for safer nighttime visibility. Not intended for housings requiring different bulb types or for systems without appropriate ballasts.