One field of our ongoing research is illumination, specifically passive, and emergency light solutions.
GITD vs Chemlight vs Tritium
Mini-chemlight, GITD tab, or tritium vial; which one and when? Depending on the application, all three have advantages and disadvantages.
Brightness over time
Given comparable form factors:
- First 10 minutes after exposure: Mini-chemlight = GITD > Tritium
- Beyond 10-15 minutes after exposure: Mini-chemlight > Tritium > GITD
- Beyond 4-6 hours after activation: Tritium >= Mini-chemlight >= GITD
For rapid changes from light to dark GITD is brighter than mini-chemlights and Tritium, for practically infinite marking in continuous low-light settings, Tritium is superior; and for fast and acute ambient illumination, chemlight is preferable.
10 years > 4 hours > 10 minutes.
- GITD: 10 usable minutes, starting immediately after charging.
- Mini-chemlight: 4-6 hours, starting at will.
- Tritium: 10 years half-life, if it's on, it's on.
- GITD: sunlight, UV-light, a 1000 lumen torch isn't enough.
- Chemlight: consumables, the more the better.
- Tritium: good as is.
Shielding and containment
- GITD: no shielding needed, contain light in mylar pouches, etc.
- Chemlight: prevent breaking prematurely or destruction by keeping within solid plastic tubes, etc.; contain light in mylar pouches, etc.
- Tritium: prevent vials from breaking by using the obligatory cage-shaped holders, contain light in mylar pouches, etc. (Tritium emits enough light to shine through 500d Cordura)
As always, more area equals more light. Area makes a big difference, since everything about light is quadratic. If you need more light, bring a bigger or more light sources, no matter which of the above.