The film I use lasts for hours once it has been exposed to light,it is equally as good as a key fob that cost a few £pounds that I bought.The film I have is sold in the main to help the aged to find light switches at night.
Perhaps the film has Tritium in its manufacture.
Nope.
Tritium doesn't need to be exposed to light, it generates it by itself, like a firefly.
Tritium is a GAS....so it would not be "in" an adhesive pad or film, etc. Its in a capsule, protected by - typically, an acrylic shell, and sometimes a metal cage around it.
I keep work lights in a box, or my pocket, so they are in the dark most of the time. If I NEED a light, its ALSO probably dark, so, GITD stuff doesn't get too much light on it to initially charge it.
A GITD film is great, but, not much different from the O-Rings. I mentioned I charge them with another UV light to get them glowing.
If a light is left behind in a dark crawlspace for example, laying in the dirt...and I realize days later, or even the next day, that I left it behind, by the time I return, the GITD is just too dark.
A tritium fob will still be brightly glowing though, and act as a beacon to guide me back to the light.
As GITD O-Rings are dirt cheap, I use them on EVERYTHING...as they improve the grip, and help me see where I put stuff. Tritium fobs are, relative to the rings, expensive, perhaps $10 each or so for good ones....but I can EASILY take a fob off one light and swap it to another if need be. I rarely use more than a dozen lights at a time (OK, sometimes...), so a dozen fobs covers most occasions. (I have more than a dozen fobs though...)
$10 for a fob to keep from losing a light might seem like a lot, but, when the lights are dedomed SR90's, Fenix TK70's, DEFT's and VPT Turbo's, etc...that's cheap insurance considering the replacement costs for the lights.
A perfect example was a lambda light I really liked, and, one day, I could not find it ANYWHERE. I was going crazy trying to remember the last time I used it, where I might have left it, etc. I convinced myself I had left it at one of the sites I had inspected and went back, and looked all over, asked around, etc....nada.
A YEAR later, I needed an insulated bag to put drinks in, and went into the garage to get one.....and noticed a strange glow coming from one bag. It was the fob from the Lambda...and the light was inside a side pocket. I had slipped the light into the side pocket a year ago, as my hands were full, and never transferred it to where it normally lived...and it sat there all that time. If I had gone to get a bag in day light, I probably STILL would not have found that damn Lambda. I had already bought ANOTHER one though, so I have two versions.
Adhesive taped on patches, or slipped over GITD rings, take a few minutes to put on/off...relatively, a lot more work....but are cheap enough to allow them to stay on.
