Yes, actually. But most vegetable seeds just need warm, moist (that's your humidity) soil. There are some plants that need light, which is why some seeds are just raked into the soil. Thyme comes to mind as a photosensitive seed. Many perennials can be tricky to start from seeds with light, freezing periods, seed surface abrasion, and soaking/stratification being some of the factors to consider.Don't some seeds need light as well as humidity to germinate?