Emisar D4K Copper 21700 High Power LED Flashlight "CUSTOM BUILT-TO-ORDER"

EMISAR D4K COPPER CUSTOM BUILT-TO-ORDER WILL SHIP ACCORDINGLY! The boost driver upgrade is available for the SST-20, Osram W1/W2, Nichia 219B R9080, as well as 519A version, each LED receives 2A current. The driver is not compatible with Nichia E21A, Nichia E17A, and mule versions of the flashlight. Please be noted that the boost driver version will have 40% less output on turbo than the regular version, it is a more efficient driver (90-95%) with longer running time and less heat. Emisar D4K copper puts a high lumen output but generates a lot of heat at the same time, please acknowledge before purchasing. Unprotected 21700, flat top battery only (not included in the price), D4K does not work with protected battery. 5/20/2025:  There is new black PVD coated stainless parts available & with new black switch buttons! You can select your options at during the time of your custom build. If the option is not selectable it's not available, the metal switch buttons won't be available will