I converted these flashlights for the purpose of urbex. These LED's generally used for indicator purposes are also extremely good for exploring abandoned structures in a quiet tactical manner. Having an output of only 200MCD the lime green (kingbright branded) LED's are good for not messing up night vision while at the same time giving you an idea of your surroundings. I honestly prefer lime green LED's over flashlights with "moonlight mode" or flashlights with red/ green or pure green LED's and even lights with incan bulbs and lenses. These type of lights in my opinion are still too bright. That and white light is generally bad for the night vision.
I chose LED's with a 20 degree viewing angle, (model No. WP7113SGC) for best optical compatibility with the coast G20's lens. It casts a very clean round beam with virtually no spillage.
The middle flashlight was a trial run using a diffused lime-green LED. It didn't work so well (and I didn't expect it to) I used it as a stop gap until the new LED's came in. It was so dim it was kindof pathetic.
I'd like to mention that the COAST G20 in stock form is an excellent flashlight. It is marketed as an inspection light but it can be used for so much more. It's low profile, has an excellent beam and is durable. I would recommend one to all of you.
Please keep in mind that the true output power of the LED is not shown on the image. Which is a tad overexposed. In practice I've notice that the light output doesn't even look very green reflecting off objects. The light is so dim that it looks basically black and white. Meaning this light barely activates photopic vision if at all