I've been interested in LED bulbs for years since we enjoy boondocking in our trailer.
Right now is a good time to be thinking about LED bulbs because they're cheaper and brighter than they ever were.
HOWEVER, not all LED bulbs are created equal. It's important to keep the current to the bulb under control especially if the battery charger is running.
There are two ways to control current, one bad and one good. The bad way is a resistor in series with the LED's. The good way is a sophisticated miniature current regulator that drops the current down if the voltage increases. The idea is to keep the number of watts to the bulb (and the heat it generates) constant even if voltage varies.
In looking at bulbs for sale on e-bay, I figured out how to tell the good one's from the bad ones.
If there's a picture of the circuitry, the good bulbs are a lot more complex.
I've included an example showing BACK and FRONT pictures of GOOD bulbs.
The best way to tell is to look for a voltage spec.
These bulbs are specification:
10pcs G4 12-5050SMD AC/DC 11~30V Bulb Super Bright LED Warm White leds DIY
Any bulb that can handle 30 volts will not be hurt by small overvoltages in trailer.
Other similar bulbs are specification 12V
Those are not such a good choice.
Hope this saves somebody a bunch of grief! It's no fun to invest in LED bulbs only to watch them burn out over a six month period!
Input: AC/DC 11~28V
light plate diameter: 30mm,
Pin length: 14mm.
color: Warm White (3000~3500k)
Life time: more than 50,000 hour