Hi all, been lurking for a while and decided to build my own light now and looking for advice on a few things and help finding potential parts.
First off the goal is a dive light with an XHP70 @ 3A+ with a 4s 14.8V LiPo 10aH pack for ~4 hours of burn time.
Question #1: Can someone confirm my thinking is correct... A 12V XHP70 @ 3A (36W) is preferable to a 6V XHP70 @ 6A (36W), because the 6V setup will lose more energy to internal battery resistance due to the higher current? Also, the 12V is closer to the 14.8V of the battery pack so the buck driver won't have to work as hard/will burn less energy.
Question #2: Is there a buck driver that can do 3A @ 14.8V input that has thermal control? I'm looking at this KaiDomain one: http://www.kaidomain.com/p/S024010.4-18V-3-Mode-Drive-Circuit-Board-for-1-x-Cree-XHP70 but it looks to only be for 6V. Alternatively MTNMAX is an option
Both are ~26mm boards
Question #3: Does anyone know of a 12v MCPCB larger than 20mm? The only 12V MCPCB I can find is the 20mm Sinkpad, all others are 6V (e.g. the Maxtoch 32mm board). If I can't find a 12V one, that'll force me to go with the 6V design.
Question #4: Any recommended 6-10 degree reflectors?
Here's what my design looks like so far with a 32mm MCPCB and a spot for a 26mm driver. The bottom nut will have a cable gland leading to an external battery pack. Reflector is TBD. Body is Aluminium
Thanks all,
Mike
First off the goal is a dive light with an XHP70 @ 3A+ with a 4s 14.8V LiPo 10aH pack for ~4 hours of burn time.
Question #1: Can someone confirm my thinking is correct... A 12V XHP70 @ 3A (36W) is preferable to a 6V XHP70 @ 6A (36W), because the 6V setup will lose more energy to internal battery resistance due to the higher current? Also, the 12V is closer to the 14.8V of the battery pack so the buck driver won't have to work as hard/will burn less energy.
Question #2: Is there a buck driver that can do 3A @ 14.8V input that has thermal control? I'm looking at this KaiDomain one: http://www.kaidomain.com/p/S024010.4-18V-3-Mode-Drive-Circuit-Board-for-1-x-Cree-XHP70 but it looks to only be for 6V. Alternatively MTNMAX is an option
Both are ~26mm boards
Question #3: Does anyone know of a 12v MCPCB larger than 20mm? The only 12V MCPCB I can find is the 20mm Sinkpad, all others are 6V (e.g. the Maxtoch 32mm board). If I can't find a 12V one, that'll force me to go with the 6V design.
Question #4: Any recommended 6-10 degree reflectors?
Here's what my design looks like so far with a 32mm MCPCB and a spot for a 26mm driver. The bottom nut will have a cable gland leading to an external battery pack. Reflector is TBD. Body is Aluminium
Thanks all,
Mike