From some quick research:
1) 10k LUX or more is needed. Most bulb brightness/intensity specs are in lumens, lux is the lumens per square meter on the surface being measured. Meaning how far the bulb is would affect the lux rating.
2) Color temperature. Daylight bulbs generally are 5000-6500k.
3) Spectrum. It seems that a full spectrum bulb is preferred, including UV light. A normal 5000k LED bulb will produce a spectrum that doesn’t measure the same as daylight. [Here is an illustrative comparison](https://ae01.alicdn.com/kf/S228efe781c2049498b29fe0d0a621232U.jpg_640x640Q90.jpg_.webp). Now, they may not measure the same, but if they look the same then that is something I don’t know if studies have been done.
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