GRV 20x T10 LED Light Bulb 921 194 192 C921 24-2835 SMD Super Bright Lamp DC 12V 2 Watt for Vehicle Boat Ceiling Dome Interior Lights Cool White (2nd Generation)

So, these light instal fantastic in our RV. They are bright, warm light, and nearly indistinguishable from the standard 'battery sucking' lights that are always installed initially in RVs. I've placed other LEDs lights in previously owned trailers, and when we acquired our 'new-to-us' 21' hybrid, I wanted to enjoy the same boondocking (dry camping) battery longevity as before. So I ordered these up, they arrived quickly, and installed them and they looked and worked fantastic.I was performing some modifications and packing the trailer last night, and had the exterior light (with these new LED bulbs) on... And I mistakingly left it on when I packed up for the evening, and went in for the evening. When I came down the next morning to walk the kids to school (about 10 hours later), I noticed that I had left it on. When I went to the trailer to turn off the light, I caught a smell of hot/burning electronics. So I turned off the light, and then felt the lens covering it - very hot... But would be even if I had left it on with a standard bulb. I took off the lens to inspect the bulb and a cloud of smoke greeted me. The bulb was charred and extremely hot. After a minute or so of letting it cool, I removed the bulb and inspected the back (circuit) side of the bulb, and found it also to be charred and melted. I am including photos of these bulbs in 'customer photos' on this item. I feel if these were to be left on accidentally for a period of time, they would likely catch fire, or darn well close to it. This was an exterior bulb on a cool night, what might the interior bulbs do if left on? These things do get hot enough to burn you within about 90 seconds or so I began to notice. The other bulbs I've purchased in the past (albeit they were a 'cool white') did not get this hot. Warm, but not hot. This is a concern for me, I'll likely be returning them to find a safer alternative for my family with three young boys... Yeah, they like to leave lights on... :)

They perform as advertised.At 12v the modules pull 90mA. This comes out to ~1w.At 11.5v the modules pull 72mA and at 12v they pull 105mA.The solder was adequate and no major issues were observed. A couple of the resistors were a little off in alignment, but well within the functional range.The module's power input is run through the MB6S rectifier chip with allows the power polarity to be applied in either configuration without worry of damage. Technically they could also be run on 17-18vAC, but a cap on the output of the chip would likely be desired to reduce flicker.The LED's are laid out in 8 parallel banks of 3 chips. This is good as distributes over voltages across multiple chips and will allow the module to continue light production even if a single chip fails.It's worth noting that the module did get warm. There shouldn't be anything to worry about at 12v and mine hit ~130°F (54°C) after 30 minutes. This said, a charging system for lead acid batteries (like in an RV or automobile) may run at ~14.5v. 176 mA was measured at this voltage which comes out to ~2.5 watts. This means they'll be significantly brighter and is still within the operating range of every component on the board. This said, 2.5 watts of heat on a module this size may be an issue for extended periods and especially in small enclosures with limited air flow. I'd expect that the components on the PCB would de-solder and fall off before a fire occurred, but the PCB would also start to break down. This should result in a blown fuse before a fire starts. Should. Future revisions could avoid this issue by running 12 banks of 2 LED's with a PWM regulation chip.More or less, they're great if used within their specifications. Limit operating times if these specifications are exceeded. They're low cost and you get what you pay for, but there isn't any protection on the boards. Check them after running for a while.

These bulbs were exactly what I was looking for. I installed all 12 as replacements for the #921 incandescent bulbs in my travel trailer. All of the bulbs worked correctly. I am pleased with the results. The brightness of these bulbs is about 10-15 percent less than the incandescent bulbs they replaced, but the battery draw is so much less, that I can just turn on more lights if I need it brighter. The hue of the bulbs is pretty warm for LEDs. I do notice that the color of my cabinets looks a little different. Perhaps a "grayer" look. Flesh tones are also somewhat washed out. This is to be expected from LED bulbs of this type.My objective was to provide adequate light with as little battery draw as possible. I feel these accomplish that.The replacement bulbs required finesse and quite a bit of force to snap into place. Sore thumbs and fingers were a byproduct of the installation.I have attached a photo of the new lights. It was dark outside when I took these, so they give you some idea of the brightness and hue of these bulbs. The camera flash was turned off.

Purchased two pack of these to replace the bulbs in all the lights in our camper. We did the warm white to avoid the bluish tint you'd probably get from the cool white version. Seems like a good color, not too yellow like the old incandescent bulbs, but not too blue like most other LEDs, almost a perfect neutral white. Brightness is pretty similar to the old incandescents, but the color makes it feel a lot brighter and less dingy.Some of the bulbs had to be forced into the light sockets, I think they just make the base of the bulbs a little thicker than they should be. Had one or two DOA, with another that has a few dead individual LEDs on the board, and one that thinks it's a strobe light from time to time. Luckily we had enough good bulbs between two 10 packs to replace all the interior bulbs.

So lets gets right to the chase.. these are simply amazing.. We have a 31' Travel Trailer that is stationed in a seasonal site and we are plugged into a 30amp service to the trailer.. given that its a travel trailer it uses a AC>DC inverter for the lights. Our rural ( we live in Canada, Ontario & trailer is located in Bruce Peninsula near Tobermory ) hydro rates just went up to 23 cents per /KWH.. yeah friggen expensive ! Anyways we got our last hydro bill and it was not very encouraging to say the least ! Typically when turning on only two sets of lights in our trailer we could hear our inverter fan kick on ( a sign that the inverter was working hard to just provide converted power to basically 2 bulbs in one light housing 18W each = 36 W and they produce a lot of heat when on for awhile.. so you can imagine a typical travel trailer with around lets say 6 light assemblies with two bulbs in each = 216Watts of energy wasted on poor less efficient lights !Now these amazing LED lights ( I got the Cool White ) are amazing , run cooler , more light not hard on the eyes and will only use 1.2Watts of energy per LCD array.. so = 2.4W per light assembly ! I replaced almost all my 921 bulbs with these ( will order more ) and I have turned on ALL 6 light assemblies with no complaints from my inverter ! 2.4W x 6 = 14.4Watts of power to light up 12 of these LED units ( 2 per light assy in my trailer ) compared to 216 Watts !! so I have essentially reduced my power consumption for lighting by - 201.6 Watts !! WoW wish I had done this sooner...

This worked well, but if you are looking for brightness, check and compare the "Lumens" rating of bulbs. My wife likes the warm light that they generated but were not as bright as the previous incandescent bulbs in our trailer. They fit well in the trailer light fixtures (T10). There is a huge difference in how little these drain the battery. I can turn on five double bulb fixtures and still not have the drain on my batteries that one of the original bulbs had in my trailer. The inverter in my trailer would spin up with two incandescent fixtures on, and now I can turn on all the lights in my trailer before I have that leave of drain. I used some of these LEDs, combined with some brighter (700 Lumens) bulbs in my trailer now.

These are decent replacements for the 921 bulb. The LED does have less Lumens than the 921 bulb however the higher spectrum almost makes up for it. I put into my main living area in the RV and am satisfied. Plus the 921 emanates from all directions where as the LED does not. Now we see how long they last...

Bought these as replacement bulbs for the incandescent bulbs that came in our travel trailer. They are brighter than other LEDs that are rectangular and have lights on all sides. These are shaped like ping pong paddles and have all the LEDs facing one direction. In a couple spots (in the kids' bunks) these were actually too bright to be just reading lights, and we used the other style. You can also install these backwards, so the LED side is facing into the fixture and has to bounce off the back of it before lighting an area, and is not quite as bright as a result.If we ever need more lights in this trailer or in another in the future, we will be duplicating this purchase. We recommend them.

Bought this 10 pack to replace the incandescent bulbs in my Camper. All 10 worked flawlessly and are much brighter, for the price they cant be beat, anywhere local I shopped couldn't even come close to this. These draw such a minimal amount of power compared to the factory ones, for the times when you cant plug into shore power, these sure allow the batteries to last much longer! would buy again!