A comparison between the Ultrafire M51, and the Acebeam K40M review
Comparison, size and output
first some day shots... to show the difference between the Ultrafire M51 and Acebeam K40M
The head of the K40M is much larger. And because of the Smooth reflector throws quite a bit farther than the M51.
The Ultrafire M51 measured 31175cd
While the K40M measured about double the M51 at +/-60000cd
The K40M has double the throw, and about 1000 lumens more output.
The M51 will give you 95 minutes of runtime in Max.
The K40M will give you 65 minutes of runtime in Max.
Throw comparison/Beamshots comparison:
Mouse OUT K40M,,, mouse OVER M51
and throw
The M51 is a little "warmer" than the K40M..
| Acebeam K40M | Ultrafire M51 | |
| Modes | 6+strobe | 4+ strobe |
| UI | Simple with mag control | Not very good |
| Stainless steel bezel | No | Yes |
| Holster | Yes, (soft) | Yes, (hard) |
| 1 handed operation | Not really | Yes |
| weight | 642grams | 642grams |
| Balance | Front heavy | Well balanced |
| Size | X | O |
| Throw | 62500 | 31750 |
| Output | +/- 3000 | +/- 2000 |
| Runtime max output | 65minutes | 97minutes |
| only in max modes on both lights | ||
| Grip | X | O |
If you just want a great light with an MT-G2, and don`t care about stainless bezel, more pocketable etc... go for the K40M.
But the M51 has some advantages as well...
Very easy to operate with 1 hand, and more pocketable.
Runtime in MAX output is longer, but has less output.
But you would always be able to get at least 1.5 hours of runtime on the M51.
Although the weight is the same, its balances better on the M51, as well as the knurling.
So they are different lights..
I still think the K40M will give you more value for the money.. but the M51 has some characteristics that could be Better for Some people... so don`t rule out the M51... especially if you can find one for a good price below the $100 mark.