Nakobo p21w 9-30V Super Bright Low Power 1156 1141 1003 BA15S LED Bulbs with Projector replacement for Back Up Reverse Tail Lights Rv lights, Xenon White

I bought 4 total at $3 per bulb. They all work upon insertion into a camper ceiling light with a 12.6V battery. I compared the brightness to a 250 lumen Anker flashlight and a 100 lumen headlamp. The brightness is very similar to the 250 lumen Anker flashlight, maybe a little brighter, but not double it's brightness. In comparing to the 100 lumen headlamp, it is about 2 to 3 times brighter, definitely not 4 times brighter. So in my opinion, it is definitely not 1000 lumen. Most likely not even 500 lumen. Probably less than 400 lumen. Giving it the benefit of the doubt, I would say it is at best no no better than 350 lumen. I think it is more likely around 300 lumen. But this is only my opinion since I didn't actually measured it. I do think it is decently bright enough for use as a camper overhead light. I wish it was 1000 lumen bright, but that is wishful thinking at $3 per bulb. The bulb works best with a cover since the focus spot light from the focus lens although bright has an ugly blue ring on the periphery. In terms of the white color of the light, I think it is a little high in the K spectrum for my taste. I prefer natural sunlight white, and this bulb's white is florescence light white. Although this light is white and bright enough for doing work, it lacks the warmth of sunlight white and also doesn't appear as bright as it can be--this loss of brightness is probably because there is a sublime, (very hard to notice if noticeable at all, i.e., practically unnoticeable unless you go desperately searching for it) very very light blue tinge in the white light. In conclusion, the white light produced is a decently bright light and is conducive for work. Also, the build of the bulb is supposedly geared for a long service life. For only $3 per bulb, this is a pretty good deal. One star off for the wildly exaggerated claim of 1000 lumen.To the seller: if you post a picture of the actual measured lumen of this product, I may consider revising my rating.