Reddit reviews STREAMLIGHT, 99075, Rubber Helmet Strap, F/3N, 2AA, 4AA Series

What is your budget?

<$20: a good book on caving, or some batteries. Lithium AA/AAA if they don't like rechargeables, AA/AAA NiMH if they do. I've had good luck with the brand Tenergy, which is sold in bulk by AllBattery.com. They're basically cheap Chinese imports but their QA is decent. (Source: I'm a professional photographer who's used them for years.) Go for the 2,500 mAh capacity. You might also consider a decent charger. More on that shortly.

<$50: One of the best chargers on the market is this bad boy, but it's somewhat expensive and only charges 4 cells at once. However, it charges them safely (not overcharging, not charging too fast, etc, which limits long-term life), can identify bad cells, and can charge almost any cylindrical battery out there, including the far superior 18650 cell, which is important for a good headlamp or flashlight. For a good headlamp, consider the ThruNite TH10 in neutral white for $40, or the same headlamp with a battery for $15 more. Note: this light doesn't use AA/AAA batteries; it uses the 18650 battery, which is slightly larger but 4 times the capacity of an AA battery and is able to discharge power fast enough to support amazingly bright lights. Every light I'm linking here supports multiple brightness modes, with a maximum brightness around 1,000 lumens, i.e. as bright as your car's headlights. They also drop to between 0.4 lumens and 1 lumen at their lowest setting, which will last for up to 70-ish days. Yes, really. That's a nice feature to have in a cave.

<$100: A good headlamp/flashlight. Most cavers I know are old-school when it comes to flashlights because they aren't aware of some of the incredible LED and battery innovations that have occured. Most of their headlamps are either small and underpowered or huge and bulky and... still underpowered sometimes. I'd recommend a ThruNite TC-12 v2 in neutral white. It also uses an 18650 battery. The light bundle I linked includes one battery and the light is USB chargable, though that charger I linked earlier will charge the battery faster.

You can add a helmet strap if you know they use a helmet. If you're looking for a headlamp instead of a flashlight, consider the ThruNite TH10 I linked earlier or the Nitecore HC30 in neutral white which is slightly more expensive. Nitecore and ThruNite are fairly similar, though in my opinion Nitecore looks more "tactical" while ThruNite's electronics are slightly better. Both are good companies, however.

<$150: If you decide to get a light and extra batteries, don't get any battery with a brand containing the word "fire". (Those brands are known for lying about the capacities and being fire risks.) I'd recommend a 4-pack of KeepPower 3,400 mAh 18650 batteries if you're going for that kind of batteries as they're a good brand and I own them myself.

Some other considerations: a nice base layer, i.e. thermal underwear. I'd strongly recommend merino wool as it's thin, light, and warm even when it's wet. Cost: $50-$100 per item for a top or bottom/long johns. And they'll always have a warm, fuzzy feeling when they think of you. ;-)

I love my skullgard but this shop I’m working with wants there company’s hats. I bought a large rubber band of amazon that had 2 holes in it to mount a regular flashlight off the side easy to remove when not in use. I’ll try to find a link later

Link: Streamlight Rubber Helmet Strap, Black https://www.amazon.com/dp/B001W7ZJYM/ref=cm_sw_r_cp_api_i_Ll5-AbXM6HV5V

https://www.amazon.com/Streamlight-Rubber-Helmet-Strap-Black/dp/B001W7ZJYM