According to Wikipedia, 43% of the sun's energy at the surface of the earth is visible light (https://en.m.wikipedia.org/wiki/Sunlight#Measurement). So just blocking the other wavelengths would help, but I'm not sure it would be a "night and day" difference, so to speak. Daylight is several orders of magnitude brighter than normal indoor lighting, so I bet you could block 80-90% of visible light, as well, and it would still look really bright out while heating the inside significantly less.