BenQ LH820ST Review

Important note: The BenQ LH820ST was discontinued by BenQ in August 2024. New units are no longer available from authorised dealers. Refurbished units do appear from specialist retailers at reduced prices. If you're building a new simulator today, the Optoma GT2000HDR is the closest current equivalent at a similar price point. This review remains live as a reference for buyers considering used or refurbished units, and because many existing installations use this projector.

What the LH820ST was — and why it was popular

The BenQ LH820ST became the benchmark mid-range golf simulator projector largely because of three things arriving in one package: a 0.497 throw ratio that matched what most short-room builds needed, a laser light source that eliminated lamp replacement hassle, and IP5X dust sealing that made it genuinely suitable for garages. At around $1,800–$1,900 when current, it sat above budget lamp projectors but well below the premium 4K options, and it delivered on its key promises.

Key specifications

Throw ratio and placement

The 0.497 throw ratio is the LH820ST's most important practical specification. At this ratio, a 10 ft wide image needs the projector roughly 5 ft from the screen. A 12 ft wide image needs around 6 ft. This allows floor mounting in front of the screen or ceiling mounting close to the screen end of the bay — both keeping the projector well clear of the hitting position.

For ceiling mounting, the 9% lens offset requires some adjustment to project cleanly to the bottom of the screen without hitting an enclosure frame. This is manageable with keystone correction, but worth knowing about before mounting. Most LH820ST installations are floor-mounted due to this offset — with a protective housing (Carl's Place makes a dedicated floor mount guard for this unit) the floor position is safe and practical.

Image quality in a simulator context

The 3,600 lumens is genuinely bright. In a garage with some ambient light — door closed, fluorescent overhead — the image is clear and watchable without having to hunt for a dark corner. The 3,000,000:1 dynamic contrast ratio is a marketing figure based on laser dimming rather than native contrast, but in practice the LH820ST does produce good blacks and colour depth for a simulator projector at this price.

The dedicated Golf Mode is a real differentiator. It boosts the intensity of greens and blues — fairway grass and sky — for more saturated, realistic course visuals. Most users enable it after the first session and leave it on. The 90% Rec. 709 colour coverage backs this up with accurate colour reproduction across the course palette.

The IP5X dust sealing — why it mattered for garages

This is where the LH820ST genuinely separated itself from most competitors. Most projectors at this price point have standard ventilation — they pull in air, cool the optics, and expel it. In a garage environment with tire dust, stored gear, and regular door opening, this ingests dust into the light engine over time, gradually degrading image quality and shortening lamp life.

The LH820ST's sealed laser engine completely eliminates this problem. The optical components — DMD chip, colour wheel sensor, laser package — are locked behind an IP5X-rated enclosure. No dust reaches them regardless of how dusty the garage gets. For a permanent garage installation, this was significant enough to justify the price premium over lamp-based alternatives.

What made it less than perfect

Input lag at 16.67ms is good but not exceptional. The lens offset made ceiling mounting slightly more complex than projectors with centred lenses. And the 1080p resolution, while standard for the category, means the image softens slightly on very large screens (14+ ft wide). None of these are serious issues in practice, but they're worth knowing.

The bigger practical limitation is now simply that it's discontinued. Refurbished units carry the original laser light source with unknown hours on it — ask sellers for hour readings if available, and factor in that a used unit has less remaining life than a new one at the same price.

Should you buy a refurbished LH820ST today?

If the price is right and the hours are low, yes — the LH820ST remains a capable projector and the IP5X dust protection is a genuine advantage that few current alternatives match at the same price. The Optoma GT2000HDR is the closest current equivalent: similar throw ratio, similar brightness, laser light source, but without the Golf Mode or IP5X sealing. For a new build, the GT2000HDR is likely the better choice at current pricing. For a refurbished LH820ST at a meaningful discount, it's still a good projector.

Frequently asked questions

What replaced the LH820ST? BenQ has not released a direct replacement. Their current golf simulator lineup includes the TH671ST (lamp, lower price) and the AH500ST. The Optoma GT2000HDR is widely used as the closest functional equivalent.

Can I still get the LH820ST new? As of 2025–2026, new units are no longer available from authorised BenQ dealers. Refurbished units appear periodically at specialist retailers including Gung Ho Golf and similar. Amazon listings may show new units as third-party seller stock — verify the seller's authorisation status before buying at full price.

Does the Golf Mode make a real difference? Most users say yes, noticeably. The boosted green and blue saturation makes course imagery look more vivid and natural. It's a software colour profile rather than a hardware feature, so the effect depends on the specific course and software, but most simulator golfers enable it after trying it.

What protective enclosure works with the LH820ST for floor mounting? Carl's Place makes a dedicated floor mount enclosure compatible with the LH820ST's dimensions. Shop Indoor Golf and similar retailers also carry projector floor guards. Measure the unit dimensions before purchasing a housing to ensure a fit.