http://www.rei.com/learn/expert-advice/headlamp.html

=> Storm 400 probably (Bad reviews for Revolt, Icon is too bulky), but better wait...


Requirements:
    2x/4x AA or 18650 (both shall be supported)
    Multiple low-and-high power modes (for reding and hiking)
    Angle regulation and spot/flood modes     
    Red light support

Black Diamond Icon (Model 2012) 70 EUR
    Icon Polar with removable battery pack (80g heavier)
    200 lumens (old model is only 100) (Cree XP-G)
    4x AA batteries (old model is 3x)

Black Diamond Icon 700 [ Assembly on lower quality compared to previous models: cheap plastic, problems wih straps.. ]
    700 lumens max (according to review it is not much better than storm)
    4x AA batteries

Black Diamond Storm 400 (good small option, the only complain it is not rechargeable) [ ~ 35 EUR ]
    400 lumens max (reasonable high-mode duration ~ 2 hours) https://www.outdoorgearlab.com/reviews/camping-and-hiking/headlamp/black-diamond-revolt
    4x AAA or BD-1500 (not 1800)
    Not rechargable

Black Diamond Storm 450
    450 lumens max (?)
    3x AAA or BD-1500
    Still not rechargeable...
    
Black Diamond Storm 500-r
    500 lumens max
    Integrated Lion battery 2400 mah (rechargeable)
    No battery replacement, no AA/AAA support [ recharge from powerbank? ]


Black Diamond Revolt 350 (could be good option, but has problems with high-mode, may be as companion light)
    350 lumens max (but according to reviews high-mode deteoriates very quckly ~ 30 minutes)
    3x AAA or BD-1800/1500
    Rechargeable
    
* Petzl Actik Core
    600 lumens max, 88g, IPX4
    Lion 1250 mah or 3x AAA				[ 2h - 7/10h  run time (more on AAA) ]
    Rechargable via usb
 
* Petzl Swift RL & Swift RL Pro [ Good, but lack of AA batteries is bad, particularly considering rather short run times (slightly better in Pro) ]
    900 lumens max, 100g/123g, IPX4
    Lion 2350 mAh (removable)			[ 2h-5h-10h run-time (both), max 550lm in standard mode (both) ] 
    Rechargable via USB (but doesn't seem to work while charging), can be used on the neck, not waterproof
    No red light in non-pro version

Petzl Duo RL / S [ 500 EUR :) ]
    2800/1100 lumens max
    Lion 3200 mAH (removable), not supporting AAA (with Actic core they were)
    Rechargeable, Cool switch button

Petzl Duo Z1/Z2
    360/450 lumens
    4x AA (6400 mah??? battery for Z1, but seems not Z2)

Petzl Nao RL (Bad reviews, check rei.com; seems uncomfortable)
    1500 lumens max, 145g, IPX4
    Lion 3200 mah (removable R1 battery)	[ 2h - 10h run-time ]
    Reachargable via USB-C, Red backlight


NiteCore HC50/HC90 60/110 EUR
    1-565/900 Lumens (Cree XM-L2 (T6) led)
    1x 18650 Li-ion cell (1hr in full)
    Dual Red (HC50) and Red/Green/Blue (HC90) lights
    - Only a single 1850 battery (MicroUSB charging in HC90)
    - HC50 (1-35-170-350-565), HC90 analog
    - HC90 has extremely nice control 

Fenix HP01/HL30 50 EUR
    210/200 Lumens (Cree XP-G (R5) led) - regulated
    2x AA batteries (2h in Turbo)
    Red light mode
    Addtional red/blue/green filters 10 EUR
    HP01 has much better spot mode

Alternatives:
 - Fenix HP30 (900 Lumenes, external 2x 18650)
 - CREE XML T6 LED 1600 Lm (2x 18650)
 - Petzl Myo Rxp 2 (no red light, 3 batteries only)
 - Mammut X-Shot