Does your department issue CR123 primary cells?. Let others correct me but I think 2x CR123 generally weighs less than 1x 18650. So there could be some lumens per weight to be gained there.
yes battery weight is a huge impact. The 2 lights that were vaiable options used 21700. The little nitcore used a 18350
Oh ok then… for some reason I thought those are 2xCR123 / 18650 size.
stay sharp,
This is really interesting. Our local Fire Dept. has just gotten the DJI thermal camera drone.
The EVO2 looks to be an even better solution.
Keep updating us as you go along.
What sort of real world flight times are you getting with the lights installed?
All the Best,
Jeff
The plan is to swap out flashlight batteries each time I swap out the drone battery. The drone battery with this payload should last about 25 to 30 minutes. The flashlight batteries will last longer but if Im landing to swap out one battery I will do both and place them in the charger while I fly the fresh batteries. I have 5 drone batteries and will have a matching number of flashlight batteries. The drone battery is $220. The flashlight battery is $10 -$15 and also rechargeable.
Great informative video.
The shots form the ground look like something from a UFO movie.
Agree the Fenix worked the best.
Thanks for sharing and look forward to next video with grass ground cover.
Later,
Keith
Very very interesting
Did the lights stay cool?
yes but they were in the down wash of the rotors at 17 degrees F so it was expected they would stay cool being fan cooled in sub freezing temps. It wont be the same on a warm summer night.
I was wondering how much the blade wash helps. Even in 17 F, my high output lights get hot so the blades must be helping a lot.
They are powerful, high speed fans only a few inches away from the lights,
A light that always impresses me for it’s size and thermal control is the Sofirn SD05 diving light. 21700 battery though. Good throw and wide beam. It will stay on high in low temps in my hand.
Can you use just the flashlight heads and run them off of the drone’s battery pack? It would require some custom wiring etc. but you’d save some weight.
17 F of moving air is basically below freeze temperature air conditioning. Easily cold enough for hypothermia / death with extended exposure.
Yes forced air movement can make all the difference in the world. Even just a little air. Thermal energy (IE heat) traverses from hot to cold… always, never the other way around. If you can continually flow cold air over the hotter surface… it will take the heat away with it.
There is no way to tap into the battery and that would void all warranties on a drone that cost about $11,000. Thats why strapping a couple $50 lights is the sought after option.
I would try mixing floody and thrower
That is a good idea. I have tried that with handhelds and it works great.
yes this was discussed in post #16, The two diff lights weight about the same.
Nice project 
I revised the design and spread the light beams apart to cover more ground. Here are the results in the video link below.
[video: Evo 2 drone lighting rev3 - YouTube]