According to FREEME the MF04 HAS as step down:
Initial test result for ASTROLUX MF04 Runtime in TURBO mode at 29°C/ 84.2°F ambient temperature. Mini usb box fan was used to provide light breeze for the light at 30cm distance.
Temperature was about 43°C/ 109°F at about 5.5min mark. There is definitely room to sustain the high output longer.
Did a runtime test for MF04 (prototype) with four pieces of SONY US18650VTC6 3000mAh 3.7V 18650s. MF04 output dropped to 63% from 100% after 8mins, and stayed plateau for another 110mins or so before shutting down itself. Total runtime in TUBRO mode was about 2 solid hrs (126mins) based on 4x 3000mAh rated cells.
Runtime for other levels will be included in soon.
T1) Attempt to re-trigger TURBO after about one minute from first automatic stepdown.
T2) TURBO re-triggered for the second time.
Event A) Discovered that my cooling fan was blowing off axis because the cable got caught with the door when closed. That could probably explain why first stepdown occurred few seconds earlier. Output increased by 5% (peak) after cooling was restored.
T3) Has slightly shorter TURBO duration compared to T1 and T2. Could be due to temperate controller restricting the output.
T4) TURBO re-triggered for the fourth time after 3min interval from previous stepdown. TURBO is able to sustain for approximately 2mins when it was given more time to cool down.
Link below info in bottom of Post #2.
That step down STOPPED me from buying it. Not sure why I considered it when my TN42vn90 BLOWS it away in output[ 5000 Lumens], continuous TURBO. and matches its throw[1.05Mcd] :+1: In the fall, winter and spring I can use turbo until battery depletion, ~ 25 minutes. In the summer I can get 10 minutes of constant TURBO,Put on Low 3 or 4 minutes and then bump back up. There is a thermal step down that has never been activated. The light just gets hot and I manually lower output.
Either FREEME is wrong[I doubt it] OR you just do not notice it OR it could be a thermal step down which he does not mention.