Mag has always been rubbish.
Oh, I know there are about a thousand people here who's dander just got right up after reading that, but it's the truth.
The optics are
terrible, and that's what matters in a light. An oil lamp with a mirror behind it has a better pattern.
I say to you, the best way to highlight a circle of darkness in a room is to fire up a Mag. Terrible. They are an abomination with some nice looking industrial design.
If they didn't look good hanging off of bat belts, they'd have died off years ago.
To make matters worse, they've thinned out the aluminum used in the assembly over time, and it seems the interior plastic has become a bit worse, as well.
That said, you can make these things worth a damn. One thing you've got is a big fat tube full of D cells. It may be time to ditch them entirely, but so long as those batteries are still around, here's how to easily use them:
1: Buy an incandescent Mag.
2: Call Malkoff and grab a proper LED solution for it.
3: Buy a textured aluminum reflector.
4: Choose a lens that's worth a damn.
Put it all together, and you've got a pretty nice (if not as durable as other options) LED flashlight with a pile of D cells to drain, at a pretty darn reasonable price.
I've got one just like that on a bracket in one of my vehicles.
You can also pick up something from Surefire. I've got a lot of their stuff. It's bright, but not notably long-lasting, and that extra light can be a drawback for things like vehicle service, where it can be blinding.
C. Crane is another notable manufacturer. They are all U.S.A. and were first to market with the LED Treklight many years ago. I ought to know. I bought the first one.
Those aren't very bright, but they last forever, and are quite durable. I finally broke one after over a decade being dragged all over the world.