Red Light Therapy vs UVB for Psoriasis — What's the Difference?

If you've been researching red light therapy vs UVB for psoriasis, you've likely come across both therapies — sometimes used interchangeably, sometimes presented as completely different treatments.  The confusion is understandable. Both involve light, both are used in skincare contexts, and both appear regularly in discussions about managing persistent skin conditions. But they work through different mechanisms and serve different purposes.

This guide explains what each therapy actually is, how they differ and what to consider if you're exploring light therapy as part of your routine.

For those already familiar with UVB therapy and looking at home-use options, our guide to UVB light therapy for psoriasis at home covers what to look for when choosing a device for home use in Australia.

What Is UVB Therapy?

UVB stands for ultraviolet B — a specific wavelength of light in the ultraviolet spectrum, typically between 280 and 315 nanometres. Narrowband UVB, which sits at around 311 nanometres, is the most commonly used form in dermatology for skin conditions including psoriasis.

According to DermNet, UVB phototherapy has been used in dermatology for decades and is one of the most established light-based approaches for managing psoriasis. It works by penetrating the outer layers of the skin and slowing the rapid skin cell production that characterises psoriasis — the process that leads to the buildup of scales and plaques.

UVB therapy has a long clinical history. It was originally delivered exclusively in dermatology clinics, requiring regular appointments over weeks or months to achieve and maintain results. The development of home-use UVB devices has made this approach more accessible — allowing people to maintain consistent treatment schedules without the cost and inconvenience of clinic visits. For those considering UVB light therapy for psoriasis at home, home devices now offer the same narrowband UVB wavelength used in clinical settings.

What Is Red Light Therapy?

Red light therapy uses visible red light, typically in the wavelength range of 630 to 700 nanometres, and sometimes near-infrared light extending to around 850 nanometres. This places it in an entirely different part of the light spectrum to UVB — it is visible light rather than ultraviolet light.

Red light therapy is used primarily for skin rejuvenation, wound healing support, inflammation reduction and collagen stimulation. It works by penetrating the skin and interacting with cells at a mitochondrial level — stimulating cellular energy production rather than affecting skin cell turnover directly.

In the context of psoriasis, red light therapy is sometimes explored for its anti-inflammatory properties and its potential to support skin comfort and reduce redness. However it does not address the underlying rapid skin cell production that drives psoriasis in the way that UVB therapy does.

Red Light Therapy vs UVB for Psoriasis — Key Differences

The distinction between these two therapies comes down to wavelength, mechanism and clinical evidence.

UVB therapy operates in the ultraviolet spectrum and directly affects skin cell production. It has decades of clinical use specifically for psoriasis and is recognised by dermatologists as a primary light-based treatment approach. Results from UVB therapy in psoriasis management are well documented.

Red light therapy operates in the visible and near-infrared spectrum and works through cellular energy stimulation. Its primary applications are in skin rejuvenation and inflammation support rather than directly targeting psoriasis pathology. Research into red light therapy for psoriasis specifically is less extensive than for UVB.

The practical difference is significant. UVB therapy targets the mechanism of psoriasis — the accelerated skin cell cycle. Red light therapy addresses symptoms like inflammation and redness without directly influencing that underlying cycle.

Can They Be Used Together?

Some people use both as part of a broader skincare routine — UVB therapy to address skin cell turnover and red light therapy for general skin comfort and inflammation support. They work through different mechanisms so there is no inherent conflict in using both, though introducing any new device or treatment approach alongside an existing routine is worth discussing with a GP or dermatologist first.

What to Consider When Choosing

If your primary concern is managing psoriasis plaques and scaling — UVB therapy has the stronger and more specific evidence base. It has been used in dermatology for this purpose for over 50 years and is the light therapy most dermatologists are familiar with in the context of psoriasis management.

For those exploring a home-based option, the Dermalight™ UVB Phototherapy Lamp is designed specifically for at-home use with built-in safety features that make consistent sessions straightforward.

If you are looking for general skin comfort support, inflammation reduction or skin rejuvenation alongside psoriasis management — red light therapy may have a complementary role. It should not be seen as a replacement for UVB therapy if psoriasis management is the primary goal.

Neither therapy is a cure for psoriasis. Both require consistent use over time to support results, and neither replaces a medically supervised treatment plan for those with moderate to severe psoriasis. Speaking with your GP or dermatologist before starting either approach is always the sensible first step.

The Practical Decision

For most people exploring light therapy specifically because of psoriasis — UVB therapy is the more targeted and better evidenced starting point. Red light therapy has genuine benefits in the skincare space but its role in psoriasis management is more supportive than primary.

Understanding the distinction helps you make a more informed decision about which approach fits your situation — and whether one, both or neither makes sense as part of your routine.