50pcs 12 Volt 3mm Red LED Lights Emitting Diodes Pre Wired 7.9 Inch DC 12v LED Light Diffused Colored Lens Small LED Lamps

Used these to light a 4mm scale model building. By turning down the voltage you get a dimmer light and the LEDs should last longer. They come with a resistor attached so it's dead easy to add more in parallel.

Excellent choice for a 12V pre-wired LED. I got the warm whites. If you're a tint snob, here's the details: ~3400K on my meter, technically has a positive duv (greenish tint) but I found the overall light quality to be very pleasant. Interestingly these are fairly low-CRI, in fact they tested lower than the average cold white emitter at around 55CRI. Not enough to knock a star off because of the value, but just beware if you're specifically looking for high CRI and accurate color rendering, this isn't your emitter.

Easy to install, a bit brighter than what I expected. They do work great 👍.

For some electronic projects around the house, with varying voltages from 5VDC to 12VDC, I would like to have some status lights included. These LEDs fit the bill nicely. Although the leads are around 30 gauge (measured 0.31mm thick on the tinned ends), their 7" usable length is plenty. The first 0.8" is the heat shrink around the built-in series resistor so if you have a shallow mounting place, be aware you'll need about an inch below the base of the LED to route the wires. Intensity is quite good even at 5V - tested with an old cell phone AC adapter rated at 4.9V. Current draw at 5V is about 5mA when the LED is on. Items arrived in a thin, long cardboard box, inside what looks like an antistatic ziploc bag. Quick count seems to say that there are 52 LEDs in here. First use will be in a project I'm doing to convert a battery operated only device to allow normal use of an AC adapter but fall back to the battery pack if AC power is lost. A coaxial power jack and a relay is all that's required, along with a bit of re-wiring of the power leads inside the device. The LED will flash whenever main AC power is off. I know that using a flashing green light to indicate a loss of power seems to go against more logical choices (red, yellow), but I chose green for the brightness over those others. The device already has a built-in flashing red LED to indicate low battery so that's another reason to go with green.

I bought these as a simple way to confirm whether a security camera is frozen or actually showing live footage. The area under surveillance doesn’t change much, and I’ve found that many modern cameras tend to lock up during 24/7 monitoring. This particular camera watches an area prone to theft and was set up to be intimidating. Flashing lights makes it be just that. The problem is that when the camera locks up, it’s hard to tell unless I notice the second hand isn’t moving. Because it’s an infrared camera, everything is shades of gray. White text over a gray background is hard to see, but a few blinking lights is not hard to see. That’s where these come in. I wired the LEDs to a USB 5V → 12V fan speed controller so I can adjust the blink rate by varying the voltage (5V faster, 12V slower). It’s a neat, low-effort solution. I only needed four, but they come in packs of 50... so for rougly $10 I’ve basically got a lifetime supply. Build quality is solid for what they are. I just stripped the wire housing and connected the leads to my power source. The size was perfect for my setup.