The hotter LEDs get, the more likely thay are to flicker and burn out.
Whether yours are voltage regulated are not is unknown. Many that are for 12v will run super hot at 14.7v.
I like LEDs as bright as possible, and use LED dimmers to take them down and reduce their amp draw heat and light output.
The actual electronic guts of this LED dimmer are a fraction of the size of the plastic casing. I usually can install the guts within other LED housings and have full dimmer control
https://www.amazon.com/XtraLED-Dimm...coding=UTF8&psc=1&refRID=HSPX6GC5VCKBBD4Q6D0E
Some voltage regulated LEDs will not respond t a PWM dimmer. Such bulbs usually list a 10 to 35vDC range or so but there are exceptions.
I buy the unregulated with a T10 wedge base. Heat at fulloutput is a factor, More voltage means more light and more heat. A resistor on such bright LEDs could extend their life. I just dim them or view them as a bit disposable as my current batch, were 50 cents each, and I have 10 left.
Resistors on LEDs are usually for the Vehicles exterior signal lights when LEDs are substituted for INcandeascnet. This is to keep they hyper blinking or the Bulb out indicator from flashing on the dashboard.
Battery charging voltages wil cause unregulated LEDS to run hotter. Whether this extra temperature is a serious detrement to their lifespan, will vary widely on the product used and the voltage it receives and the temperature it get to.
Regulated LEDs can cause RFI, radio frequency interference. They can knock out some Over the air TV stations. Even some unregulated LEDS can do this.