Near-infrared saunas are a more secure alternative to authentic infrared saunas. Incandescent bulbs emit significantly less electromagnetic radiation than other types of light bulbs, which is why they are frequently used in near-infrared saunas.
However, just as there are numerous infrared saunas available, there are numerous near-infrared saunas as well. Before ordering, verify that the unit you choose uses incandescent bulbs.