Since the subject of the maglite bi-pin bulbs has come up, I thought I would give you a very quick beam shot of it.
I have a 4D and found that it had the new bi-pin bulb in it. It is touted as having a Whopping 96 lumens! I wanted to show y'all what it looks like and I have to add that I turned the stock reflector into a MOP, due to the standard Maglite rings.
I am also using my 1D Maglite with an XM-L T6 1C pushing 2.8A on high. I don't know the amps on medium, but if I remember it was about 800ma.
Lastly, I thought I would answer the question of modding the bi-pin, by adding more than the standard 4 D cells. I have a shot with 5D cells. 6D cells blows the bulb, but 5D cells work. EDIT: Which means 5-C alkalines or 5-C nimhs will fit in the 4D, with the bi-pin bulb.
All shots are with my Canon P&S set on manual, ISO200, 1 second shutter, aperture?? I think I should have used .5 seconds shutter, but it is what it is. All shots are a little brighter than what I think I saw.
Here is the 4D Maglite with 4 cells. I adjusted it for the tightest spot. I left the adjustment the same in the shot with the 5D cells.
Here's the 1D XM-L T6 on high
Here's the 1D on medium
Here's the 4D with 5D cells. Notice the spot is larger and I did not adjust the Maglite's focus, nor did I move my position.
Here's a mouse over of the 4D and 5D cells. 4D first, 5D on mouseover.
I have not done any other beam shots with the camera, but I did walk out to look at the "across the pond" scene and while the XM-L is much brighter at 75 yards, the 4D with 5D cells in it, lights up the 75 yard range well enough to see what's out there clearly. I was surprised at how few lumens it really takes for my eyes to see "good enough". The added "firepower" from the XM-L actually hurts my night vision, so there's "wow factor" and then there's useable light.
We mostly go for the WOW factor, but I actually felt more comfortable using the 4D at a distance. Easier on my eyes... I guess I'm just an old school incan guy at heart.