I am pretty sure that the thread is dead.
I am still waiting for the code myself from freeme, so I went ahead and bought the MF01S with batteries during the 9.9 sale. Diffuser and holster were bought seperately.
Do you realize that you are asking someone who posted that 9 months ago?
There is a big difference in brightness. 4000K is rated as 11000 lumens, while 5000K and 6500K are rated as 14000 and 15000 lumens respectively.
I just bought the 5000K version, much better tint than the MF01 mini 6500K (SST20x7) I have, no more green shift at low, its more yellow, than green. On the other hand, both flashlights pale in comparison to my Nichia 219c (astrolux s43).
Thank you for the information. I had the opportunity to compare personally. In fact, the 5000K seems a little brighter, but the 4000K CRI makes up for it. I choose 4000K.
The old code (bgmf01s) still works but gives a price of $89 on the BG international site. bg1128 code gives a lower price at $84. May be higher or lower depending on your site.
One of BG’s little tricks. Prices can vary greatly depending on which site you use. To change sites go to account settings.
How different are they? They both use TIR lenses so the beams should be fairly comparable. As a quick and cheap experiment you could apply some frosted clear tape over some of the LEDs to get a little more wider beam.