After checking Unheard’s thread reviewing the D1 I changed the information about the LED : it is a Cree XP-L HI 6500K instead of an Osram P8 or P9 as I initially suspected.
Thanks Unheard for the correct information 
After checking Unheard’s thread reviewing the D1 I changed the information about the LED : it is a Cree XP-L HI 6500K instead of an Osram P8 or P9 as I initially suspected.
Thanks Unheard for the correct information