Here's the irony every flashlight owner runs into eventually: the power goes out, and the one tool built for darkness is somewhere in the dark with you. Nightstand drawer, bottom of the bag, door pocket of the truck. A light you can't find is a light you don't have.
The fix is making the light tell you where it is. There are three ways to do that, and they work very differently: a glow-in-the-dark body that charges from light, an illuminated tail switch that runs off the battery, and glow vials that live in a slot or on a lanyard. Here's how each one actually behaves, what it costs you, and which one belongs on which light.
Option 1: A glow-in-the-dark body
GITD material is phosphorescent: it soaks up light, then gives it back slowly once the lights go off. The curve is always the same. Bright for the first few minutes, then a softer afterglow that keeps fading over the next few hours. No battery, nothing to fail. UV charges it fastest; a lamp or sunlight works fine. A light that spent all day in a dark pocket won't have much glow left to give.
The NightGlow S11 takes this about as far as it goes: the whole body glows. It's a keychain-sized USB-C light with a main white beam, a wide side light for reading or working, red, red flashing, red-and-blue flashing for a roadside breakdown, and a UV mode. That UV mode is the clever part, because shining it on the body recharges the glow. Hit it for a few seconds before bed and it's easy to spot on the nightstand. It also has a magnetic tail, so it sticks to a car door or the fridge, and it goes from empty to full in about 35 minutes.
At $14.99 it's cheap enough to buy several, and the multi-packs (2 for $26.99, up to 6 for the price of 5) cover the usual spots: keys, nightstand, glove box, a kid's backpack.
The honest limit: phosphorescence fades. At 3am the S11 is dimmer than it was at 11pm. It's a locator, not a nightlight.
Option 2: An illuminated tail switch
This one is powered. A tiny LED built into the tail switch glows while the light is off, which is exactly when you're hunting for it, and it runs off the main cell. It doesn't fade overnight. It's as visible at 4am as it was at bedtime, which is why it's our pick for a nightstand or truck light.
Convoy makes these in two flavors. The rubber illuminated tail switch ($3.99) shows the most light. The metal version ($4.99) swaps the rubber boot for a stainless or black metal button with a subtler glow. Both come in eight colors: orange, blue, green, red, purple, pink, white, and an RGB slow fade that cycles on its own. They fit the S2+, S6 and C8+, and there are dedicated versions for the T2/T3/T4 and a 20mm kit for the M21A, M21B, M21C, M26C, L21A, S12, S16 and S21B.
Three things to know before you order:
- It's illuminated or forward clicky, not both. The lit switch is a reverse clicky (click on, tap to change modes). If you want momentary-on, that's a different board, and you have to pick one.
- S2+ host color matters. Black, gray, gold, MAO, copper, brass and most titanium S2+ hosts take the switch swap. The colored anodized hosts (blue, green, red, orange, purple, tan, silver, cyan) use a pressure-fit switch and can't, and titanium is split by finish. Check the Convoy S2+ switch FAQ before you buy.
- We'll install it. Buy the switch with a light, leave a note on the order, and it shows up already installed.
The honest limit: powered means it's always drawing a little current. It's a small draw, and on a light you carry and recharge regularly you'll never notice. A light that sits in a drawer for months will slowly drain its cell, though. For long storage, loosen the tailcap a quarter turn to break the circuit, or pull the cell.
Option 3: Glow vials and the 25-cent mod
You've probably seen tritium vials on high-end knives and lights. Tritium is a sealed radioactive gas that glows on its own for years with no charging, but its sale is regulated in the U.S. The practical alternative is a glow vial: a 1.5 x 6mm phosphorescent tube that fits the same size tritium slot and charges from sunlight, a flashlight, or UV like any other GITD material. They are not tritium, and they won't glow all night on one charge. They're good for dropping into a tritium slot, epoxying into a lanyard bead or zipper pull, or marking the gear you grab in a hurry.
If you already own an S2+ or C8+, the cheapest glow upgrade in the store is the blue rubber tailcap button, which glows in the dark and costs a quarter. It's passive like the S11 body, so there's no drain, and the button still swaps on the colored S2+ hosts that can't take an illuminated switch. (Only the blue one glows. The green looks like it should and doesn't.)
Which one should you pick?
- Keys, kids, glove box: NightGlow S11. It glows, it carries its own UV to recharge that glow, and the magnet earns its keep at a roadside stop.
- Nightstand or truck door: a Convoy with an illuminated tail switch, rubber if you want the most glow. It'll still be lit at 4am.
- A light that lives in a bag for months: skip powered glow. Use the glowing tail button or a glow vial on the lanyard, with zero drain.
- Cheapest upgrade to a light you already own: the 25-cent blue button. Then decide if you want more.
Stack them
These aren't competing options, they're layers. A lit tail switch on the nightstand light, an S11 on your keys, and glow on the grab-and-go gear means you can always find something in a blackout, and that something is a light. If you already carry a 365nm UV light, a few seconds of it recharges GITD faster than any lamp.
Every light gets misplaced eventually. For less than a fast-food meal, you can make yours tell you where it is.