I assume you're talking about light in weight and texture of cake as in not heavy and dense? Have you ever tried looking into chiffon recipes? They are soft and pillowy light but still moist.
I have one called moss cake but you need to get hold of potato starch ( also potato flour or potato starch flour or katakuriko), if you can get hold of that let me know and I translate the recipe. How ever Swedish recipes are in decilitres and not cups so you will get it in millilitres.
Beyond Buttercream has a really light and fluffy white cake recipe. She used to have it on her blog, but so many people raved over it that she decided to sell the recipe instead ... and rightly so, it is delicious.
There is a discussion about it on her blog here: https://fromscratchsf.wordpress.com/2011/07/26/white-cake-part-3-with-recipe/
You can purchase it here: https://www.etsy.com/listing/178952866/beyond-buttercreams-base-cake-recipes-by
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