Re: LD75Cvn - New Fenix King (Must Have)
From KJ57's excellent review, it looks like you do have instant access to turbo, and strobe at least. Other modes too it seems, but not 100% clear.
"Interface:
From a light that has 5 leds built-in and is driven by four 18650 cells, we can't expect a lightweight. But anyway, it fits good in the hand, you have enough grip and the LD75C is easy to handle. The three button have a new shape and print, the instant button is placed slightly lower. In darkness, this lower placed button will help you also to right upper. Short press on lower "sun" button will give instant-strobe, longer press than one second instant turbo (4000 lumens). You need to deactivate this by a short click, it has no momentary. Press and hold the right upper button for white light, cycle through the modes by short clicks. The same for the left upper button, but then you'll have color modes. New feature is the power check: quick double press the C-button to show current voltage: Blue (high) Green (good) Red (low) Red flashing (critical). Innovative, I've never had this before!
Modes:
By pressing the on/off button (and you click to cycle) you enter the 5 "normal" white modes: ECO > LOW > MID > HIGH > TURBO. Press (and short click) the C-button for the 5 color modes: WHITE > RED > RED SLOW FLASH > RED/BLUE STROBE > GREEN > BLUE. The LD75C memorizes last used mode. A short click at the lower "sun-button" will give Strobe, press and hold this button for more than one second to enter turbo mode. Short click the sun-button for off. All combinations are possible, (a great point here!): for example Turbo + Red/Blue Strobe, White eco + Red, Green + Strobe. NOTE: to reach the maximum output, you've to choose white color + turbo mode, to reach to maximum output of 4000+200 lumens. Instant turbo works only with 4 leds. Because this bunch of modes and combinations you have this is an interesting light for hunting, rescue and so on. Strange thing is the lack of a SOS-mode. Wish it had a beacon mode too…"