NVSW719AC ”Super High Luminance LED” :
https://led-ld.nichia.co.jp/en/product/led_product_data.html?type=NVSW719AC&kbn=0
- Forward current : 1500mA
- Pulse Forward current : 1800mA
- Forward voltage : 6.76V at 1050mA
- Thermal resistance : 2.5°C/W
- Light emitting surface : 2x2mm (4mm²)
- R9050
- 3535 XP compatible footprint
The Vf is weirdly high for a 6V LED.
For comparison the B35AM : If=1800mA, Pulse If=2400mA, Vf=5.93V at 1400mA, Thermal resistance = 1.5°C/W, LES=9.7mm², non DTP 3.65mm footprint.
XHP35 HI (gen1) : LES=5.9mm²
There is also a flat version of the 219C : NVSW219C-V2
https://led-ld.nichia.co.jp/en/product/led_product_data.html?type=NVSW219C-V2&kbn=0
- Forward current : 1800mA
- Pulse Forward current : 2400mA
- Forward voltage : 2.89V at 700mA
- Thermal resistance : 2.5°C/W
- Light emitting surface : 1.6x1.6mm (2.56mm²)
- R70 and R8000
- 3535 XP compatible footprint