Summer sun is the best source or UV light, and many people find their Psoriasis settles very well in summer.

Treatment in winter can be aided by artificial lamps; smaller lamps are usually not strong enough, but impulse type lamps, wall mounted 'fluorescent lamp type' lamps and the larger 'solarium' lamps are all suitable.

It is usually best to apply a tar or dithranol preparation daily, to be followed later by UV light treatment.

Unfortunately, some Psoriasis sufferers are rather sensitive to light, and may not be improved with this treatment.