How much FIR does an infrared blanket give off and what does that mean
In short
Figures like six to fourteen micrometres sound precise. With an infrared blanket, in practice it is about a broad band of warmth.
- The peak is at roughly nine micrometres
- Temperature determines where the peak lies
- A blanket always radiates across a broad band
- The wire material does not determine the wavelength
You often read about far infrared and about figures like six to fourteen micrometres. That sounds precise, but what does it actually mean in practice for your infrared blanket from Luxyor?
Here you will find a clear explanation without any fuss, with a rule of thumb you can check yourself.
The short answer
Luxyor sauna blankets give off far infrared warmth with a peak at roughly nine micrometres at normal operating temperatures. That falls within the often quoted band of six to fourteen micrometres.
So it is not one single fixed line but a broad distribution, which is mainly determined by the temperature of the warm surface.
What exactly FIR is in an infrared blanket
FIR stands for far infrared. It is heat radiation that you cannot see, but you can feel. In a wellness context, it usually refers to the part of the infrared range that lies roughly in the zone from six to fourteen micrometres.
That range is interesting because it closely matches what the skin itself emits and comfortably absorbs. Warmth in that range therefore feels natural.
How temperature shifts the peak
The peak of the emitted infrared shifts with the temperature of the surface. That follows from Wien's law. In plain language: the peak wavelength in micrometres is roughly 2898 divided by the temperature in Kelvin.
| Surface temperature | In Kelvin | Peak wavelength |
|---|---|---|
| approx. 40 degrees Celsius | 313 K | around 9.3 micrometres |
| approx. 60 degrees Celsius | 333 K | around 8.7 micrometres |
| approx. 70 degrees Celsius | 343 K | around 8.5 micrometres |
Important to remember: the blanket always radiates across a broad band, and the peak only shifts slightly when you set the temperature higher or lower.
Why you so often hear six to fourteen micrometres
Human skin itself emits infrared with a peak at roughly nine to ten micrometres. Warmth in that range therefore feels natural. Water in tissues also comfortably absorbs warmth in this zone.
So six to fourteen micrometres is a handy way of describing a useful range. It is not a hard limit and certainly not a magic number.
Does the material determine the wavelength
Luxyor uses heating wires with silicone insulation. That choice was made for safety, flexibility, durability and an even distribution of warmth.
In practice, the exact wavelength is not set by the wire material, but by the surface temperature and the properties of the outer cover, such as PU leather or Oxford fabric. In other words: the wires make sure the blanket heats up safely and steadily, and the temperature of that warm surface determines where the peak in the spectrum lies.
It is not the wire that determines the wavelength, but the temperature of the surface.
What you notice during a session
In practice, you notice nothing of micrometres. What you feel is a pleasant, deep warmth that feels even across your body. Many people find that pleasant with stiff muscles or a tired feeling.
Start gently with a low temperature and short sessions, and only build up after that. Comfort is a better measure than a number on the display.
Practical tips for comfortable FIR warmth
- Start with a comfortable temperature in the middle range, for example forty to sixty degrees
- Only increase it if it keeps feeling pleasant
- Use sessions of twenty to thirty minutes
- Wear thin, breathable clothing or use a cotton towel
- Drink water before and after your session and stop if you feel uncomfortable
A higher setting mainly changes the intensity of the warmth, not its type. If it feels too intense, you lose nothing by choosing a lower setting.
- Adjustable temperature and timer, so you can build up gently
- Even distribution of warmth across the whole surface
- 60 days to change your mind and a 2 year warranty
In conclusion
An infrared blanket from Luxyor gives comfortable FIR warmth with a peak at roughly nine micrometres at normal operating temperatures. That lies within the commonly used zone of six to fourteen micrometres, the peak depends on temperature, and we are open about that. Take a look at the collection of infrared sauna blankets or read more in the knowledge base on infrared sauna blankets.
Frequently asked questions
Does the Luxyor blanket produce a fixed wavelength?
No. The blanket radiates across a broad band in the far infrared. The peak is around roughly nine micrometres at normal operating temperatures.
Does the wavelength change if I turn it up?
Yes. A higher temperature shifts the peak slightly towards shorter micrometres. It always stays a broad distribution and never a single fixed value.
Does the type of wire matter for the wavelength?
The wire and the silicone insulation mainly provide safety and even warmth. The position of the peak follows from the temperature of the warm surface.
Why do you keep hearing six to fourteen micrometres?
That's an indication of a useful range that matches well with what the skin itself emits. It's not a hard limit and not a magic number.
Which temperature is best to choose?
Start in the middle range, for example forty to sixty degrees, and only increase if it keeps feeling pleasant. Comfort is a better measure than a number.
