BenQ LH830ST VS BenQ TK705i

Both the BenQ LH830ST and the BenQ TK705i share a laser light source, which is a meaningful baseline advantage over traditional lamp-based projectors. However, the similarities largely end there. The most striking divergence is lamp longevity: the LH830ST is rated at just 200 hours in standard mode, compared to the TK705i's 20,000 hours — and the gap widens further in eco mode, where the TK705i reaches 30,000 hours against a nominal 0.5 hours for the LH830ST. In practical terms, this means the TK705i can run for years of daily use before the light source degrades meaningfully, while the LH830ST would require far more frequent servicing or replacement — a significant operational cost consideration for any installation.

Acoustic performance also favors the TK705i. Its 26 dB standard noise level (dropping to 24 dB in eco mode) is noticeably quieter than the LH830ST's 33 dB and 29 dB respectively. In a quiet meeting room or home cinema environment, that 7 dB difference is perceptible and can affect viewer comfort during extended sessions. The TK705i also consumes less power at 250W versus the LH830ST's 320W, which compounds savings over its much longer operational life.

On physical footprint, the LH830ST is the more compact and lighter unit at 3,400 g and roughly 7,714 cm³ of volume, versus the TK705i's 3,800 g and ~9,775 cm³ — an advantage if portability or tight mounting spaces matter. Overall, though, the TK705i holds a clear edge in this group: its dramatically longer laser life, quieter operation, and lower power draw make it the more practical and cost-efficient choice for long-term or fixed installations, while the LH830ST's smaller form factor is its primary physical advantage.

The resolution divide here is the defining split: the LH830ST outputs at 1080p, while the TK705i delivers native 4K. For cinema-quality detail, large-screen presentations, or any use case where the audience sits close to the image, 4K resolves significantly more texture and sharpness — though in a large venue where viewers sit far back, 1080p at 4,000 lumens can still produce a punchy, highly visible image. That brightness advantage is real: the LH830ST outshines the TK705i by a full 1,000 lumens, making it more capable in ambient-light environments like classrooms or conference rooms where blackout conditions aren't guaranteed.

The TK705i counters with a 5 ms response time versus the LH830ST's 16.7 ms, a gap that matters for gaming or fast-motion video where trailing and blur become visible. It also supports HDR10+ — the dynamic metadata upgrade over standard HDR10 — which both units otherwise share alongside HLG. The TK705i's motorized focus adds installation convenience, particularly useful when the projector is ceiling-mounted and manual adjustments are difficult to reach. The LH830ST's manual-only focus is a minor inconvenience in fixed installs but less of an issue in portable setups.

On throw distance, the LH830ST's 0.5 m minimum throw confirms its short-throw credentials, giving it a meaningful deployment advantage in tight spaces — the TK705i requires at least 1.4 m to start projecting. The winner depends squarely on use case: the LH830ST is the stronger choice for bright, space-constrained environments prioritizing visibility, while the TK705i is the better fit for controlled home cinema or gaming rooms where resolution, HDR fidelity, and response time take precedence.

Wired connectivity tips in favor of the TK705i, which offers 2 HDMI ports versus the LH830ST's single port. In practice, two HDMI inputs mean fewer cable swaps when running multiple sources simultaneously — a laptop and a streaming stick, for example — making it a more flexible hub for living room or multi-device setups. Both projectors match on USB (2 ports each) and include an S/PDIF optical output for routing audio to an external sound system, so neither has an edge on those fronts.

Wireless connectivity, however, swings decisively toward the LH830ST. It supports Wi-Fi and Miracast, neither of which the TK705i provides. Wi-Fi connectivity enables direct network access and broader streaming flexibility without relying on a paired device, while Miracast allows screen mirroring from Android devices and Windows PCs natively — no app or adapter required. The TK705i does include Chromecast built-in and AirPlay, as does the LH830ST, so Apple and Google ecosystem users are covered on both units. But the absence of Wi-Fi on the TK705i means it depends on those cast protocols or a wired source to function wirelessly, which is a meaningful limitation in environments without a dedicated media player attached.

Neither unit offers an RJ45 ethernet port, so wired network connectivity is off the table for both. On balance, the two projectors trade blows: the TK705i wins on wired source flexibility with its dual HDMI, while the LH830ST holds the broader wireless advantage through native Wi-Fi and Miracast support. Users who prioritize cable-free screen mirroring across device types will find the LH830ST more accommodating; those running a fixed multi-source setup will appreciate the TK705i's extra HDMI input.

Audio output is where these two projectors diverge most sharply in this group. The TK705i packs a 2 x 8W stereo speaker system, delivering 16W of total output across two channels — a configuration that produces genuine spatial separation and enough volume to fill a mid-sized room without an external audio setup. The LH830ST, by contrast, offers a single 2W mono speaker, which is essentially adequate for system alerts or quiet supplementary audio but falls well short as a standalone sound solution for any serious viewing environment.

In practical terms, the TK705i's stereo setup makes it considerably more self-contained for home cinema or casual use where connecting a soundbar or AV receiver isn't always convenient. The LH830ST's 2W mono output is honest about its role — it's a projector designed for professional or commercial installs where external audio infrastructure is typically assumed. Both units share built-in smart TV functionality and remote control, so day-to-day operability is on equal footing outside of audio.

The TK705i holds a clear and unambiguous edge in this group. The combination of stereo channels and an eightfold increase in total wattage means its built-in audio is genuinely usable as a primary output, whereas the LH830ST's speaker is best treated as a fallback rather than a feature.