By Liyi Signal Product Team | August 19, 2026
When evaluating warning light solutions from Liyi Safety Equipment Co., Ltd., buyers often narrow their selection to two flagship product lines: the 39000 series and the 61000 series. This comparison examines the key differences in dimensions, construction, and features that determine which series fits specific vehicles and operational requirements. Both series carry ECE R65 certification but differ significantly in LED light bar specifications.
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Before getting into the differences, it helps to know what they have in common. Both the 39000 and 61000 series:
Carry ECE R65 certification for road legality in European and international markets.
Support ECE R10 (EMC) to protect vehicle electronics from interference.
Bear CE marking for European economic area compliance.
Operate across DC 9–30 V, covering both 12 V and 24 V vehicle systems.
Use polycarbonate (PC) lenses with UV stabilization to resist aging and yellowing.
Are manufactured by an ISO 9001-certified company with over 12 years in warning signal equipment.
Both lines serve the same core buyer: distributors, fleet operators, and government procurement officers specifying roof-mounted warning lights for professional vehicles.
The most immediately visible difference is the width.
39000 series: measures 300 mm wide with a body thickness of 70 mm and a total height of 136 mm including brackets. Its modular construction offers 17 length options ranging from 350 mm to 2,220 mm — the widest length range in the Liyi portfolio. This makes the 39000 the natural choice for fleet managers covering vehicles from compact patrol cars to large engineering trucks with a single product family.
61000 series: is narrower at 240 mm wide, giving it a lower visual profile on the vehicle roof. Length options span 590 mm to 2090 mm — sufficient for most commercial and emergency vehicle applications. The reduced width also opens up magnetic mounting as an option for shorter models.
| Dimension | 39000 Series | 61000 Series |
| Width | 300 mm | 240 mm |
| Thickness | 70 mm | — |
| Height (with brackets) | 136 mm | — |
| Length range | 350–2,220 mm (17 options) | 590–2090 mm(11 options) |
| Magnetic mount option | Yes (short models) | Yes (short models) |
ECE R65: The 39000 series holds Class 1 and Class 2 approval. The 61000 series also carries ECE R65 certification. Class 1 covers lower-intensity applications; Class 2 is required for emergency vehicles in demanding visibility conditions.
ECE R10 (EMC): Both series support ECE R10 certification for electromagnetic compatibility. In practice, this means the light will not interfere with your vehicle's radio, GPS, or sensor systems. For modern vehicles with CAN bus electronics, R10 is not optional — it is essential.
CE marking: Applies to both series for market access in the European economic area.
GB-13954-2009: The 61000 series additionally complies with this Chinese national standard. Relevant for buyers operating in or sourcing from China.
Note: Liyi Safety Equipment Co., Ltd. does not hold ATEX, IECEx, or SAE certifications and cannot provide documentation for these standards.
39000 series uses imported Mitsubishi polycarbonate (PC) lens with UV-stabilized additive; base in high-strength ABS. The two-layer PC lens + ABS base construction is chosen for long-term outdoor durability against UV exposure and impact.
61000 series also uses PC lens and ABS base but adds a third structural layer: an aluminum alloy frame that reinforces the housing. This aluminum layer serves two purposes — it adds structural rigidity and functions as a heat sink for LED thermal management.
The aluminum heat-sink design in the 61000 is the key structural difference. LEDs generate heat that, if not managed, reduces both output and lifespan. The 61000's aluminum substrate with integrated reflector design moves heat away from the LED array more efficiently. For vehicles operating in sustained high-temperature environments or extended-use duty cycles, this is a meaningful advantage.
39000 series uses a conventional LED arrangement with pre-set flash patterns selectable via trigger wire or built-in switch. The patterns are fixed by design — appropriate for most standard warning applications.
61000 series uses a microcontroller-based circuit that supports programmable per-LED control. Each individual LED in the bar can be addressed independently, allowing more complex flash sequences than a standard alternating or rotating pattern. If you need a custom flash pattern for a specific operational requirement, the 61000's programmable architecture is designed to support that.
For buyers who need standard alternating or double-flash patterns, both series cover the requirement. The 61000 adds flexibility for specialized applications.
39000 series mounts via stainless steel gutter brackets or permanent L-bracket installation. No magnetic option in this series. Installation is straightforward where a permanent mount is acceptable.
61000 series uses the same bracket approach for standard installation. Additionally, shorter models (typically under 1,000 mm) support magnetic mounting, giving operators a quick-attach option for vehicles that share lights between shifts or do not warrant permanent installation.
If your fleet includes vehicles that need a light only for specific operations, the 61000's magnetic option reduces changeover time.
This is a clear differentiator.
39000 series supports an integrated loudspeaker rated up to ≤120 dB, installed in the mid-section of the bar. This allows a single unit to provide both visual warning (the light bar) and audio warning (the siren) without adding a separate speaker unit. For operators who need the combined signal — police, emergency response, or high-visibility escort work — this is a significant feature.
61000 series does not offer a built-in siren speaker in standard models. Audio warning, if required, needs to be addressed through a separate siren unit.
If integrated audio-visual warning is part of your specification, the 39000 series is the only choice between the two.
Q: Which series is better for construction vehicles?
Both are suitable for construction applications. The 39000 series is preferable if you need maximum length flexibility (including short 350 mm units) or require integrated audio warning. The 61000 series is preferable for compact vehicles where the narrower 240 mm profile is an advantage and per-LED programmable control is desired.
Q: Which series is better for emergency vehicles?
Both carry the necessary certifications. The 39000 series is the right choice if integrated siren capability is required. The 61000 series is suitable for applications where the narrower profile, enhanced thermal management, and programmable flash control are priorities.
Q: Which series has a built-in siren speaker?
Only the 39000 series supports an integrated siren speaker (≤120 dB). The 61000 series does not offer this in standard configurations.
Q: Which series is easier to install?
The 61000 series is easier to install on short-wheelbase vehicles where the 240 mm width fits without modification, and where magnetic mounting is preferred. For full-length installations, both series use standard bracket mounting with comparable installation effort.
The 39000 and 61000 series share the same certification foundation and operating voltage but diverge meaningfully in four areas: width, LED control architecture, structural materials, and audio capability.
Choose the 39000 series when you need maximum length flexibility (including sub-600 mm options), an integrated siren speaker, or the simpler pre-set flash pattern approach.
Choose the 61000 series when you need a narrower profile for compact vehicle applications, per-LED programmable flash control, aluminum-alloy structural reinforcement for demanding environments, or magnetic mounting convenience.
Both series are backed by ISO 9001-certified manufacturing and full ECE R65 and R10 documentation available for buyer verification.
Download our full product comparison sheet (PDF)
Side-by-side spec table for the 39000 and 61000 series with dimensions, certifications, and ordering codes.
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About the Author
Written by Liyi Signal's product team — an ISO 9001-certified manufacturer with 12+ years specializing in LED warning lights and signal beacons for industrial and fleet buyers.
Published: August 19, 2026 | Last updated: August 19, 2026
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