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You can use opaque trash bags. Check for opacity then find the size that loosely slides over your carboys. I've daylight streaming into my brewing area and unusually long primary fermentations, yet no skunk aroma.

Cover the carboys in a blanket for no light exposure.

For skunked beer, we're worried about Violet and UV light. There's a lot of information available on this, so I won't go into that science. Basically, we want to limit as much light less than 500nm as possible and all light under 400nm (UV) if possible. Halogen bulbs follow a similar pattern to incandescent bulbs (ref). This chart compares different bulbs, ...