What type of light do plants grow better in a grow light a regular light bulb a blacklight or sunlight Why?
Sunlight. Light is measured in Lumens, the Sun emits anywhere from 32,000 and 100,000 lumens per square meter (depending on the location). A typical grow light (High Pressure Sodium / Metal Halide) produces around 50,000 lumens per square foot. In peak conditions, the Sun can double the lumens of any grow light. Also, grow lights arent well rounded in spectrums, Metal halides emit mostly a blue spectrum while High Pressure Sodium Lamps emit mostly red spectrum. The sun is well rounded on both spectrums. The other lights you mentioned cannot be used to grow plants to potential.
plants vary dramatically as to how much sunlight would benefit them. some plants grow better in direct sunlight while others thrive shaded conditions. the fact is all plants need sunlight to produce food through photosynthesis. so the best answer is that the vast majority of plants grow better in sunlight rather than shade