As discussed with you, obviously you are overexposing to UV light, thereby delivering more energy causing it to burn/phototoxicity
. Moreover you were doing it daily, whereas it should be done every alternate days.
I would suggest that you discontinue with UV light therapy
Apply momate cream twice daily for a week. Thus should relieve the discomfort and redness
Thereafter you may restart with UV light therapy every alternate days. Begin with just 30 seconds exposure and increase by 10 seconds every alternate day till you fell that there is mildly perceptible erythema
. The exposure time at which this mildly perceptible erythema appears should be continued as it is without any further increase.
Along with UV therapy you may use momate cream during day time and tacroz for night time application.
till the next 2-3 months and see if the disease responds to the treatment.