300 lux is pretty bright. More than normal room lighting. So there needs to be sunlight getting in and wherever the keyboard is, it should not be too shielded from that.
Keep in mind that’s if it’s depleted it needs 300 lux for 2 minutes to start working when it’s fully dead. If it’s just sustaining itself it will probably get away with a lot less.
300 lux is pretty bright. More than normal room lighting. So there needs to be sunlight getting in and wherever the keyboard is, it should not be too shielded from that.
In an office you’ll easily get over 300 lux.
Keep in mind that’s if it’s depleted it needs 300 lux for 2 minutes to start working when it’s fully dead. If it’s just sustaining itself it will probably get away with a lot less.
I do not know how much it needs to sustain a charge. They don’t say it, so I do not assume it is better.