The radiation source can be composed of a number of uv LEDs any suggestions will be useful
Deuterium lamp source (D2-lamp: 200-400nm) and near-UV LED (370-390 nm)
The UV LEDs are nice, but can be somewhat expensive and have a short lifetime (although they are getting much much better and that may not be as much of a concern theses days). The problem you have is that UV-B LEDs may be too weak for for your application. The UV LEDs may be too narrow bandwidth for your application.
I think the problem is how close you want to simulate the sun's spectrum.
If you need high intensity, the answer is probably different than if you just want a spectral source.
In the past I have used a monochromator and a combination of deuterium and Xeon lamps then I could calibrate against a standard photodiode.
http://www.newport.com/UV-Solar-Simulators/999849/1033/info.aspx?xcid=goog-ppc-1130&gclid=Cj0KEQiAuqC2BRDVxMSnpa-mhZoBEiQAFta8wRFBXoWPKI_CC4Lkjk5uXS8ViHIj9Q4nhKFUIFfsYJUaAuSy8P8HAQ
http://www.intl-lighttech.com/sites/default/files/pdf/datasheet/UV-LED-SL-Datasheet-web.pdf
Can provide you some comparisons.
If cost is really a driving factor, You might want to consider using a Xeon lamp with a quartz or fused silica envelope, and a deuterium lamp with appropriate filters.
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