luxlover
Banned
When is 9 volts \"not\" 9 volts (in a P91 module)?
I received my SureFire P91 lamp bezel on Saturday. Using my E1e body, two Dspeck 123 battery extensions, and a Z57 tailcap, "that sucka is bright." That sucka also says 9V (for 9 volts) on the side. Well, something was wrong with that lamp. When my good buddy with a regulated power supplied applied "exactly" 9 volts to the module's leads to see how much current the lamp would consume, the lamp worked.......and then it didn't work.......... At no time did the voltage exceed 9.00 volts. After seeing that the lamp did not work with my three battery light, I took a peek at the lamp's filament with a magnifying glass. By golly, the filament had a break on one side, where the coiled section meets the vertical section. The lamp was deader than dead, and neither of us know why. This is why I chose the title for this post to be "When is 9 volts "not" 9 volts in a P91 module?"
Even though when a P91 lamp is energized by three 123 batteries, the batteries have a voltage drop to less than 9 volts (about 7.80 volts) due to the huge current draw, there was no reason that the regulated 9 volts should have burned out the lamp. The lamp is rated to handle 9 volts, plus a little more as a means of protection against overvoltage spikes. Are SF's lamps conservatively rated at 9 volts, but are in reality not able to handle that level?
So what gives with this burned out 9 volt lamp? Should I call "Ghostbusters?"
I received my SureFire P91 lamp bezel on Saturday. Using my E1e body, two Dspeck 123 battery extensions, and a Z57 tailcap, "that sucka is bright." That sucka also says 9V (for 9 volts) on the side. Well, something was wrong with that lamp. When my good buddy with a regulated power supplied applied "exactly" 9 volts to the module's leads to see how much current the lamp would consume, the lamp worked.......and then it didn't work.......... At no time did the voltage exceed 9.00 volts. After seeing that the lamp did not work with my three battery light, I took a peek at the lamp's filament with a magnifying glass. By golly, the filament had a break on one side, where the coiled section meets the vertical section. The lamp was deader than dead, and neither of us know why. This is why I chose the title for this post to be "When is 9 volts "not" 9 volts in a P91 module?"
Even though when a P91 lamp is energized by three 123 batteries, the batteries have a voltage drop to less than 9 volts (about 7.80 volts) due to the huge current draw, there was no reason that the regulated 9 volts should have burned out the lamp. The lamp is rated to handle 9 volts, plus a little more as a means of protection against overvoltage spikes. Are SF's lamps conservatively rated at 9 volts, but are in reality not able to handle that level?
So what gives with this burned out 9 volt lamp? Should I call "Ghostbusters?"