TrustFire DF50 is a diving flashlight specially designed for scuba diving, cave diving, free diving and other underwater sports lighting.
The three light sources are: ultraviolet light, red light, and white light, which can meet different needs. up to 150 degrees flooding can provide 6500 lumens of underwater lighting.
Using 3pcs 21700 3.7V 5000mAh customized rechargeable battery pack.
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First of all, a warm welcome to BLF, TrustFire2021! Have a great time over here. :-)
Lately, I was given the opportunity from Jacob (TrustFire Deutschland) to testing some of your new models, such as T1R, MC3, MC1, MC12, .... I hope to presenting my feedback anytime soon.
One little request:
May I ask you to create / move any commercially related threads of yours into the "commercial sellers spot" subforum?
https://budgetlightforum.com/forum/marketplace/commercial
This is part of the rules here on BLF. Thanks a lot for your understanding.
Some feedback concerning the DF50 model:
I really appreciate that you support PowerDelivery with PPS and up to 20V 3A (= 60W input power!). Not sure if those 22V are still within the specs of PD, though. Anyway, that's quite a lot of power to recharge three 21700 batteries. If my calculations are correct it is very close to a translation of 5V 4A per battery. Maybe others can join in and tell about their thoughts. For a long life cycle of the battery pack it is maybe better to use a lower input power of 36W.
Is the battery pack an integrated entity, i.e. can customers exchange those batteries in the battery pack themselves or would we need to buy a new battery pack from TrustFire if the pack is broken or worn out? In the latter case I must admit, I would not support this idea. I would encourage you to offer the option to run DF50 with replaceable standard 21700 batteries.
XM2 means probably Cree XM-L2? 6000K is okay but for underwater lighting I would highly recommend looking for warmer tints with a higher proportion of red light in the visible spectrum, i.e. 4000K - 5000K. Maybe you can try using Luminus SST40 5000K (same 5050 XML footprint) or maybe Cree XM-L2 or XM-L3 in some warmer tints? Best would be using an emitter with high color rendition ("HighCRI") of 80 or 90 CRI.
XE-3535 red LEDs are probably Cree XP-E(2) red LEDs? That's alright. On BLF there are some interesting discussions about deep red light (650nm and beyond) and its biochemical effects on the human eye. Maybe deep red lighting could be useful for underwater applications, too.
The user interface...
Most people on BLF/TLF prefer a single click to turn on/off.
There's some potential for improving that mode order. Being forced to cycle through all lighting modes is not very user-friendly.
My proposal:
When the flashlight is ON, hold the side switch to change brightness between low mode (default) and high mode
When the flashlight is ON, doubleclick to cycle to the next mode group: white light (default) - red light - ultraviolet light
My proposal:
When the flashlight is OFF or ON, triple-click the switch to enter into SOS mode, another triple-click to return to standard mode, single-click again to turn OFF.
I do not recommend this on lights using ultraviolet light. There is a potential risk of injuring one's eyes if the light is turned off and on again after using the UV mode. I would rather recommend using mode memory not at all or restricted to white and red light only.
Double-click from OFF is in 99% of all flashlights used for triggering the turbo/maximum brightness mode.
My proposal:
4 fast clicks from OFF to (de-)activate the electronic lockout.
While locked, hold the switch temporarily to use moonlight (very dim brightness mode)
Yeah, a lotta people will refuse to buy a light just because of a “nonstandard” UI.
Press’n’hold from off should go to lowest mode, 2click to turbo, maybe 3click for blinkies, and that’s it.
For nonstandard functions (eg, switching emitters) sure, your own way of doing that would be fine.
And 6500K is so 3-years-ago.
Gotta ask, though. What’s that doodad hanging off the light? I see those a lot on diving lights, don’t recall hearing any mention of what it does.
Hello,This is the “ball joint” for easy mounting to any-camera system such as Xiaoyi, Gopro, action cameras and DSLR camera. the joint can be easily installed for camera system an easily uninstanlled for handheld use.
thanks for your advice.