Generator shutdown on leading power factor
Non-filament LED bulbs have a bridge rectifier and capacitor in their mains supply. That's usually not a problem as the current spikes that kind of supply creates are small for a few watts LED bulb. It doesn't matter then.

For that reason (and size), the PFC requirements today's mains supplies have to adhere do not apply to LED bulbs. And thus, many of them do produce those current spikes visible as capacitive reactance.

It becomes a problem as soon you have a whole building illuminated with those nasty things. Your generator is in no case happy about the current spikes. Inverter UPS may even fail. That's why your vendor told you to use a line reactor.

It has to be generously sized to smooth the spikes. The power factor will certainly stay capacitive but that's something a synchronous generator can deliver. Inverter UPS will still give you a headache.



As an alternative, you may want to switch to filament LED bulbs (no capacitor) or high quality LED bulbs with a PFC supply.