Some roses can tolerate less sun than others. Do you happen to know which roses you purchased?

You may need to find your roses a new home, though. While the roses could probably do without direct sun during the summer, they will need it during the winter. Less than 4-6 hours of sunlight causes lanky/twiggy growth & sparse bloom.

The two varieties I have are the Fragrant Cloud and the Diana, Princess of Wales which I think was re-named Elegant Lady.

Neither of these has a reputation for growing in shade, I'm afraid. FC is prone to powdery mildew in spring and fall. Diana POW hasn't been renamed that I've heard. When first released, a percentage of each sale was set aside for her charity foundation. It's been widely available for the past few years so the benefit probably expired. Both are very fragrant and FC prefers a light pruning to a hard pruning come January.

Are there any special garden lights with UV rays that can be put in or near the trees so they think they are in the sun? I am new to gardening, so am unsure what is out there as far as that goes.

I really don't know about garden or UV lights. Checking with a local supplier or mail-order service might answer your question.