Wavelength:
The 308nm treatment device uses a wavelength of 308nm.
The 311nm treatment device uses a wavelength of 311nm.
Energy Density:
The energy density of the 308nm treatment device is relatively high, usually between 50-60mJ/cm?.
The energy density of the 311nm treatment device is low, usually between 20-40mJ/cm?.
Irradiated parts and applicable diseases:
The 308nm treatment device is generally used to treat skin depigmentation diseases such as vitiligo. It can be used on white spots and has a better effect on localized vitiligo.
Although the 311nm treatment device is also suitable for vitiligo, it is mainly used to treat inflammatory skin diseases such as plaque psoriasis.
Irradiated area and vitiligo type:
The 308nm treatment device has a narrow irradiation window and is more suitable for patients with small area and localized vitiligo. It uses xenon chloride 308nm excimer light, which has a single wavelength, no stray light, higher energy, and faster onset of effect.
The 311nm treatment device has a wide irradiation window and is more suitable for patients with systemic and large-area vitiligo. It uses narrow-spectrum medium-wave ultraviolet light with a peak at around 311nm, which contains other bad ultraviolet bands. The light energy is relatively low, the onset of effect is slower, and the single exposure time is long.
Ease of use and price:
Due to its small irradiation area, the 308nm phototherapy device may be more suitable for patients with small localized white spots. At the same time, due to its technical characteristics and light source life, the equipment cost and maintenance cost may be higher.
The 311nm phototherapy device has a large irradiation area and is more suitable for patients with systemic and large-area vitiligo. And due to its light source characteristics, it may be more affordable.
Safety and effectiveness:
308nm excimer light is considered to be a better wavelength for inducing apoptosis of T lymphocytes caused by vitiligo and psoriasis, and the treatment effect is fast and significant. However, it should be noted that after using the 308nm excimer phototherapy device, some patients may develop symptoms such as erythema and edema.
311nm narrow-band UVB is also an effective method to treat vitiligo. It has low cost, short treatment time, quick effect, high total effective rate, is not easy to relapse after recovery, and has good safety and tolerance.
