12 Volt 921 Wedge Replacement LED Bulb, T10 12V Interior Lighting RV Light Bulbs for Trailer Motorhome 5th Wheel, 400LM Marine Boat Dome Light Replacement(5Pack, 3000K Warm/Soft White)

I love these. I replaced the lights in 3 small trailers with these, and there are 2 key things you notice right away: First, the difference in lighting is astounding, particularly if you've never seen the inside of a small trailer in anything but the soft white, yellow glow of standard bulbs. These LEDs are almost too bright at first, but that's just because you're used to the old bulbs. You'll be glad you made the change. Second, in the summer, your regular bulbs really contribute to excessive heat - thus cooling costs. Not with these! The difference has to be felt to be believed. If you run the lights alot, you'll notice - fast. You'll notice as soon as you walk by an overhead fixture and don't feel the heat on your head!In addition to lowering the heat, saving on cooling costs, these things are so efficient I don't worry anymore about leaving lights on. It's not wasteful, it's incredible not having to flip the lights off religiously trying to keep costs under control because the energy usage drops so tremendously. I've replaced all the bulbs in my 3 units with these. The can be a little tight to snap in, but that's snugness and I'm glad of it for the sake of limiting any possible moisture issues. Great products. I bought spares since the cost is fair. Haven't even had to use ONE spare yet, but I'm ready!

These are 12V AC or DC. Being 4 watts, they are way brighter than any others I have found. I replaced all my landscape bulbs with these and they run cooler and brighter, and should last more that the paltry 100 hour life of the incandescent bulbs.

replaced 921 incandescent blubs in my camper they are at least 50% brighter and they don't get nearly as hot. color spectrum is the same as the incandescent which is exactly what i wanted. bulb is larger thank a standard 921 is if space is a problem beware. i cant comment on longevity as i put them in today but will update later. I will be buying more.

Really nice and bright! Recommended to a friend who also liked them!

This fits my RV light fixtures. I hope they last longer than a few months like other brands have done. Will update if they don't last.

Exelente lo tengo en mi rv y en mi Freightliner Columbia

Put these in my RV bath vanity light. Good color and very little heat.

Finding T10 LED lights that are bright and run cool is a difficult task. These units are both bright and run cool. Have had these on for 4-6 hours continuous without any heat issues.