Need help creating a custom sky to run static glare images

I want to create two custom skys to take two images to assess where and when solar glare occurs in reflective glazing. One sky would have 6 long stripes from east to west representing the months of sunlight and the second showing short north to south stripes showing the times of the day.
Please help!

The Radiance forum might be a better place to post this question. I think there are already a few posts about using an HDR image to create a sky.

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