REVIEW: Olight I3S-CU . First Impression (Pics and runtime)

Thanks guys for comment.
I have bought the raw version, (not polished), perhaps is a preferable finish for some people, when it arrives I will include some Pics here for comparison.

Good review.

nice review!

Brass is so much harder then copper and aluminium, one wonders why there are not more flashlights being made from it.

Love the looks of your Maratac!

Hi!!!

- I have tested again, after step down, I wait a few seconds, and cycle again to high mode. The light maintain again for 3 minutes the high mode, with a power over 90% of initial

Do copper or brass have any advantage transferring heat compared to aluminum? How would the three rank from best to worst?

I think the better transmission of heat is copper and the worst is SS, I am not sure what is the best between aluminium or brass, but really, for this aaa with NiMH, in the real use, I not perceive difference.

Yesterday receive the unit in fisnish not polished: “raw version”, I like both….
bought here in http://www.ebay.com/itm/OLIGHT-i3S-cu-CREE-XP-L-HD-LED-180lm-AAA-BRASS-FLASHLIGHT-/391377307507 hkequipment

Some Pics for comparisson:

The manual says copper but you described it as brass.

nice collection.

It is brass, we take cu to be copper as that’s it’s chemical symbol, but the Chinese seem to use cu to describe brass - they did the same with the silver i3s and described it as cu, but it was brass too - so blame the Chinese lol

Great review :slight_smile:

Yes, both are brass. I sorry for use the chemical symbol Cu….but is the name of this light,… O:-)

The manual page you showed described it as copper with gold plating.

In china perhaps they use the word copper for describe sometimes the brass alloy.
I have read some descriptions of this in his web: “bronze body processed by PVD coating with titanium-gold coloration.” or ” It is made of high heat conductivity and low electrical resistivity brass alloy”…

But is brass, in his web says brass, in my review says brass in the first sentence… I think is clearly that it is made of brass….

The advantage brass, aside from appearance, is that it is easy to work with. A German told me it was invented for no other purpose than to be easy to machine, and it is the standard by which machining ease is measured. So there is a level of complexity and and precision at which brass becomes cheaper to make than aluminum, in spite of the cost of the copper content. It also can be soldered.
Copper conducts heat and electricity better than aluminum, by volume, but I think brass not as well. Those are conduct much better than steel or titanium.

Anyone try a lead test kit on the raw brass one to see whether any lead is detectable in the alloy? I don’t know if a negative result would be conclusive but it would be good to know if there is a positive result.

Anyone know of another light of this size with the same reflector and LED typ?

Thrunite Ti3 - same LED (XPL), same body dimensions.

Does the jetbeam u have double the battery life on high compared to this?

Check the runtime graph in this review Review: JetBeam Jet-u - XP-G2, AAA | Candle Power Flashlight Forum

Where can I find that particular model?