Peep this NeoPixel RGBW Neon-like LED Flex Strip with Silicone Tubing! OK its a bit of a mouthful but check out the beautiful pics! It has a diffused look like neon, but without the need for expensive transformers, glass tubing, inert gasses, or a Las Vegas casino license. They look great, are super easy to use, and are a great way to make your projects light up!
It's flexible and bendy with a solid chunk of translucent silicone rubber as a diffuser.
The silicone makes for a strong, durable weather-proof casing. While not guaranteed for dunking underwater or long-term outdoor exposure, they're durable enough for projects that have to survive the outdoors, like cosplay, bike lighting or festival decorations. You can cut this stuff with wire cutters.
You'll get 1 meter long tube that is sealed at one end, and has a JST SM 3 pin connector in the input. Provide 5V on the power pins, and provide your standard issue NeoPixel (WS281x) data on the third pin. There are 60 NeoPixel-compatible LEDs inside. Don't forget to share the ground pin between the 5V power supply and your microcontroller. Boom - you're glowin' in style.
Don't forget to set your NeoPixel driver for RGBW mode, which is not the default usually. The 4th channel is connected to the 5500K white LED element.