Guide to Choosing Infrared Heating Lamps

How an Infrared Heating Lamp Works

Infrared lamps operate by utilizing electromagnetic wave technology within the infrared spectrum. These waves are not visible to the human eye but generate heat when they come into contact with objects and surfaces. These waves are safe and used in various everyday contexts.

The lamp contains an electrical resistance or a special incandescent bulb that emits infrared rays when powered. Unlike traditional heating systems that warm the surrounding air, infrared lamps provide direct and targeted heating to objects and people within their coverage area.

Protection Classes

The first feature to consider when looking to buy a heating lamp is its protection rating, which indicates the environment in which it can be installed. The IP protection rating distinguishes heating lamps between indoor, outdoor, and protected outdoor use. The IP class represents the degree of waterproofing of the infrared lamp against the entry of foreign bodies, dust, and moisture.

The IP protection class consists of two digits: the first indicates protection against the entry of solid objects, while the second digit indicates protection against moisture. These numbers range from 0 to 6 for the first digit and up to 9 for the second; the higher the number, the higher the protection. For example, an outdoor lamp may have IP44 to withstand light rain or IP65 to withstand storms and more intense water jets.

Types of Infrared Waves

Short Wave IR-A

Short infrared waves represent the most common and efficient variety, capable of starting the heating process in just one second after turning it on. However, it is important to note that this type of wave generates more concentrated heat, which manifests immediately but dissipates just as quickly when the lamp is turned off. This is because they are the most effective at penetrating the air (about 97%), immediately radiating the surfaces they hit; however, while they are well-absorbed by the body, they can be reflected by smooth or light-colored surfaces. These types of waves are closest to the visible spectrum and have a ruby red color. The bulb temperature is very high, ranging from 700 to 1200 °C.

Fast Medium Wave IR-B

These types of infrared waves have a greater heat diffusion capacity, ensuring a uniform, intense, and comfortable distribution of heat. This phenomenon is due to the limited penetration of the wave in the air, which contributes to a more natural sensation of warmth and retains heat even after being switched off. Fast medium waves are most used in industrial settings for their better power-to-heat distribution ratio, but they are also the most expensive and generally less well-known type.

Medium-wave quartz lamps reach operating temperature in about 40 seconds. Furthermore, fast medium infrared waves emit very little visible light, and the bulb temperature can reach 500°C.

Long Wave IR-C

These types of infrared waves are generally found in radiant heaters (wall or floor heating) or in indoor ceiling lamps. This is because their radiant effect is lower and is felt more when in immediate proximity. These waves are completely invisible, and their thermal characteristic does not exceed 95 degrees Celsius.

Quick Comparison Between Infrared Lamps

IR Bulbs with Oxidized Resistance

The resistance, generally made of a metal alloy (nickel-chromium or iron-chromium-aluminum – FeCrAl), is oxidized in a controlled manner, forming a ceramic protective layer based on metal oxides that acts as an electrical insulator and a radiant surface.

What does this involve?

1. Predominantly Long-Wave IR Emission

The oxidized layer allows for high surface temperatures but not as high as a tungsten or quartz lamp. The typical emission is 2.5 – 10 µm (long infrared), more similar to radiant panels or ceramic resistances.

2. Very Uniform Heat

The oxide distributes heat consistently and reduces hot spots, making the emission "softer" and more stable.

3. Greater Durability

The oxidized surface protects the metal alloy from oxygen and corrosion, increasing temperature resistance (up to 800–1000 °C). Furthermore, it limits the formation of cracks, allowing the lamp to last longer than quartz or carbon IR lamps.

4. Usually Lower Cost

The technology is simpler (no quartz, no tungsten, no vacuum or pressurized gas), which decreases production and, consequently, retail costs.

5. Slower Response

Unlike filament lamps, their heating time is 20–60 seconds, with a similar cooling time. This makes them unsuitable for situations requiring instant heat.

Quick Comparison with Other IR Bulbs