Morimoto 3in STi-R Clear Glass Projector Lens Upgrade - Better Beam

In this review the Morimoto 3in STi-R Clear Glass Projector Lens Upgrade is assessed for drivers who want a noticeable lift in the optical quality of OEM Japanese Koito bi-xenon projectors. The bottom line: if you are retrofitting or refreshing a Koito 27mm focus projector and want a crisp, optically clear lens that reproduces the look and cutoff of a JDM STi projector, this upgrade delivers the most immediate improvement in beam quality and aesthetic appeal for the money.

Key Features

• 100% Optically Clear Glass: Produces a sharper, more consistent beam pattern compared with dulled or scratched factory lenses, improving perceived light output and visual clarity.
• STi-R Design Benchmark: Matches the JDM STi projector lens performance characteristics so users get a familiar, high-quality retrofit appearance and cutoff.
• Compatibility with 27mm Koito Bi-xenon Projectors: Designed for the family of Koito projectors that use a 27mm focus, making it straightforward for common retrofit platforms.
• Supports Common Bulb Sizes: Works with projectors that typically accept H7, H11, D2S, and D4S bulbs, so it fits a range of existing setups without changing lamp type.
• Aesthetic and Performance Boost: Restores the crisp projector look while improving raw light distribution for a cleaner cutoff and better on-road visibility.

Who It's For

The upgrade is best for enthusiasts and DIY mechanics who already have Koito bi-xenon projectors with a 27mm focus and want an easy, high-impact improvement. It is especially useful for people performing a retrofit who want the visual and performance characteristics of a JDM STi projector without sourcing rare OEM parts.

This lens is not aimed at drivers who need a full headlight replacement, are using non-Koito projectors, or who cannot confirm projector focus size; those users should verify compatibility or consider a different projector solution.

Pros & Cons

Pros

• Clear glass construction yields a noticeably sharper beam and more precise cutoff for improved night driving.
• STi-R optical profile brings a desirable, JDM-style appearance to compatible projectors.
• Direct fit for many 27mm Koito bi-xenon projectors and works with common bulb types for flexibility.

Cons

• Compatibility limited to projectors that accept the 27mm STi-R lens, so fitment must be confirmed before purchase.
• Does not include installation hardware or bulbs, so additional parts or labor may be required for a complete retrofit.

Specifications

Product type	3in STi-R Clear Glass Projector Lens
Lens material	Optically clear glass
Designed for	27mm focus Koito bi-xenon projectors
Compatible bulb sizes	H7, H11, D2S, D4S (common)
Intended use	Retrofit / OEM headlight upgrades
Optical profile	STi-R (JDM benchmark)

Our Verdict

The Morimoto 3in STi-R Clear Glass lens is a focused, high-value upgrade for anyone retrofitting or restoring compatible Koito bi-xenon projectors. It reproduces the desirable STi-style beam and improves visual clarity without replacing the entire projector, making it a practical choice for DIYers and enthusiasts who prioritize beam quality and appearance.

Frequently Asked Questions

Will this lens fit my projector?
It fits the family of Koito bi-xenon projectors that use a 27mm focus; confirm your projector focus size before buying.

Do I need different bulbs to use this lens?
No, common bulb sizes like H7, H11, D2S, and D4S are supported by projectors that accept this lens, so bulbs typically do not need changing.

Is installation included?
The lens is sold as the optical component only; installation hardware or labor are not included and may be required for a complete retrofit.