Excimer treatments at 308nm have been widely published. They are associated with very effective phototherapy, faster responses and lower side effects.
Alopecia Areata
Atopic dermatitis
Psoriasis
Vitiligo
VITILIGO
Vitiligo repigmentation by excimer lamp is now very well documented. 

Br J Dermatol. 2012 Sep;167(3):468-78. doi: 10.1111/j.1365-2133.2012.11008.x. Epub 2012 A review of monochromatic excimer light in vitiligo . Park KK, Liao W, Murase JE.


Vitiligo has been treated for decades with narrow-band UVB (NB-UVB) but it's now proven that one's get better results with excimer lamp, see for instance:

J Eur Acad Dermatol Venereol. 2007 Aug;21(7):956-63: Comparison between 308-nm monochromatic excimer light and narrowband UVB phototherapy (311-313 nm) in the treatment of vitiligo--a multicentre controlled study. Casacci M, Thomas P, Pacifico A, Bonnevalle A, Paro Vidolin A, Leone G.


Many publications also demonstrate the superiority of excimer laser above any other light. But comparison beetween excimer laser and excimer lamp shows excatly the same results, which is not suprising as they use the same light, see for instance:

Br J Dermatol. 2010 Jul;163(1):188-92. doi: 10.1111/j.1365-2133.2010.09778.x. Epub 2010 Mar 23. 308-nm excimer lamp vs. 308-nm excimer laser for treating vitiligo: a randomized study. Le Duff F, Fontas E, Giacchero D, Sillard L, Lacour JP, Ortonne JP, Passeron T.


You can get get more clinical results on vitiligo with excimer devices on the US National library of medecine: click here

PSORIASIS
Like for vitiligo treatments, first excimer procedures were performed with laser on psoriasis. Many published results have proven the effectiveness of these treatments. Excimer lamps reach the same clinical results:

Br J Dermatol. 2005 Apr;152(4):750-4. Comparison of the 308-nm excimer laser and a 308-nm excimer lamp with 311-nm narrowband ultraviolet B in the treatment of psoriasis. Köllner K, Wimmershoff MB, Hintz C, Landthaler M, Hohenleutner U.

J Dermatol. 2009 Nov;36(11):579-82. doi: 10.1111/j.1346-8138.2009.00710.x. Efficacy of 308-nm excimer light for Japanese patients with psoriasis. Niwa Y, Hasegawa T, Ko S, Okuyama Y, Ohtsuki A, Takagi A, Ikeda S.


You can get get more clinical results on psoriasis with excimer devices on the US National library of medecine: click here

ATOPIC DERMATITIS
Among the auto-immune diseases, AD is very "excimer light sensitive":

Photomed Laser Surg. 2008 Feb;26(1):14-8. doi: 10.1089/pho.2007.2116. Efficacy of monochromatic excimer light (308 nm) in the treatment of atopic dermatitis in adults and children. Nisticò SP, Saraceno R, Capriotti E, Felice CD, Chimenti S.


You can get get more clinical results on AD with excimer devices on the US National library of medecine: click here

ALOPECIA AREATA
By reducing the population of T-cell by the hair follicule, excimer lamps have shown very good results on AA:
 

Indian J Dermatol. 2013 Jul;58(4):326. doi: 10.4103/0019-5154.113954. 308-nm Excimer Lamp for the Treatment of Alopecia Areata: Clinical Trial on 16 Cases. Ohtsuki A, Hasegawa T, Komiyama E, Takagi A, Kawasaki J, Ikeda S.

J Dermatol. 2010 Dec;37(12):1032-5. doi: 10.1111/j.1346-8138.2010.00942.x. Epub 2010 Sep 29. Treatment of alopecia areata with 308-nm excimer lamp. Ohtsuki A, Hasegawa T, Ikeda S.


You can get get more clinical results on AA with excimer devices on the US National library of medecine: click here