Is Class 4 automatically better than Class 3B? Nope. Class 4 gives you more available power, but laser class is primarily a safety and hazard classification. For photobiomodulation, the whole treatment setup matters: wavelength, irradiance, dose, spot size, pulse structure, treatment time, tissue and technique.
Quick answer 🧠
Class 3B: portable, targeted, typically less expensive, with slower energy delivery.
Class 4: higher available power, faster energy delivery, often useful for larger treatment areas and high-volume professional use.
Neither is automatically “better.” They solve different problems.
1. Portability 🐴
For horses, portability matters. A handheld Class 3B system can be practical around tendons, joints, lower limbs, the back and other targeted areas without wheeling a cart around the barn.
Portable Class 4 devices also exist, but many higher-output professional systems are larger and require more substantial power, cooling and safety management.
That is a big reason we started the VanHorn laser line with a portable Class 3B platform: it travels around the horse with you instead of asking the horse to come to the machine.
2. Price 💰
Class 4 systems usually involve a larger investment. That can make perfect sense for a veterinary hospital or rehabilitation facility treating many animals each day.
For an individual horse owner or mobile practitioner who wants a targeted, portable tool, a well-designed Class 3B device can offer a very different value proposition without requiring the investment of a large professional platform.
3. Output vs. dose ⚡
More watts means more available optical power. It does not automatically mean a better treatment.
Energy (joules) = Power (watts) × Time (seconds)
Higher-powered systems can deliver a given amount of energy in less time. But wavelength, irradiance, fluence, spot size, pulse characteristics and tissue interaction still matter.
This is why comparing therapy lasers by one giant watt number is incomplete. Photobiomodulation research shows that biological response depends on a combination of treatment parameters, not power alone.
4. Application style 🎯
Class 3B: often a good fit for deliberate, targeted treatment over defined areas.
Class 4: higher available power can be useful for larger treatment areas or when treatment speed and patient throughput matter.
With higher power comes a greater need to manage irradiance, movement, exposure time and tissue heating appropriately.
5. Does Class 4 automatically penetrate deeper?
Not simply because it is Class 4. Tissue penetration is strongly influenced by wavelength and tissue optical properties. Higher incident power can increase the amount of light available at depth, but “Class 4 penetrates deeper because it is Class 4” skips a whole lot of physics. 🔬
Which one fits your job?
If your priorities are portability, targeted work and a lower entry cost, Class 3B may make more sense.
If your priorities are maximum available power, larger treatment areas, faster energy delivery and high patient throughput, Class 4 may make more sense.
The VanHorn takeaway
I do not think the best laser is automatically the one with the biggest watt number printed on the sticker. I care about whether the wavelength, output, dose, treatment area, usability and safety make sense for the job.
That is why the VanHorn Portable Class 3B Laser is built around portability and targeted equine use. And it is also why higher-powered Class 4 technology has a legitimate place in professional equine therapy.
Different tools. Different strengths. Pick the one that actually fits the job. 🐴🔬
Xoxo,
Eiren
References
- U.S. FDA: Laser Products and Instruments
- Zein et al.: Review of Light Parameters and Photobiomodulation Efficacy
- Systematic Literature Review of Veterinary Laser Therapy
Educational information only. Laser therapy should be used responsibly and in accordance with device instructions, veterinary guidance and applicable law.
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