Maglite ML300L 4D
This thread is primarily about the 6D version of this light. However, having just purchased the 4D version of this light, I'll post the runtime graphs here, rather than making a separate thread.
The 4D version of this light is fairly new. Maglite makes an interesting claim (here) on the 4D version, which would imply that you'll get 1000 lumens continuously. I have not seen this type of claim on their other lights. From Maglite add (snip):
The runtime graphs will tell us if the above is true . . . .
We'll start with 4 NiMH Powerex D cells. Note the common characteristic I've seen with other Maglites when first turned on. The output ramps up to peak brightness during the first minute, before throttling way down. Note also, I could not get the claimed 1000 lumens with the Texas Ace Calibrated Lumens Tube (although we're within 10%).
Here's the same graph zoomed in to the first 15 minutes:
The 2nd test is with 4 Duracell Quantum D cells. Note Maglite uses alkalines on their runtime tests. Note again, the initial ramp-up to peak value in the first minute.
Here's the same graph zoomed in on the first hour:
Conclusion: The above graphs seriously contradicts Maglite's statement . . .
" . . . but they only run for a short time before the brightness dims down. Well, not this one. Not the ML300L 4D LED Flashlight by Maglite"