It depends.
If you are maxing your lights at your current schedule you will need to reduce your lights or you could exceed the DLI for the plant.
2 light things to worry about. Saturation point from to high power or to close. If way out damage can take an hour or less. This is hard on plant tops. Currently wo CO2 most strains are saturated at 75,000 lux or about 1100 ppfd for a 12 on 12 off. Numbers are average.
The second is the total amount the plant gets in 24 hours called the DLI. Most strains have a problem over 50 DLI again wo CO2.
There are charts online to understand this and to convert a reading into DLI.
If you have no way to measure light energy you will hafta learn the reactions to excessive light as well as too little light. Each reason will make the plant act different.