For a “headlamp” I LOVE my Sofirn SC21, but I always wear a cap and I never take the light off of it so its always ready for duty. I did have to modify the clip to stay on the cap bill securely but that’s easy with a 1/8 inch rod and a pair of pliers.
You can not go wrong with D25 for a headlamp
+1 for the D25 
I think the best really inexpensive headlight is the Boruit D10.
Thank you for all the suggestions, a few questions remain.
Can anyone recommend me a AA flashlight?
Does the recommendations so far support protected 18650 batteries?
How does the filter work and actually apply to the flashlight?
1. Covoy makes decent AA LIGHTS.
Lumintop Tool is also a good AA.
2. I do not use protected 18650’s, so I do not know.
3. The ZWB2 filters out light that is not 365nm.
It installs in place of the lens.
ZWB2 filter for UV 365nm light , 20.5mm diameter, 2mm thickness
Thank you. Now i need info on the other two remaining topics. Does the suggestions support protected 18650 and does anyone have any recommendations for a good AA flashlight.
Single cell lights don’t need protected 18650s.
Make sure the light has low voltage warning though. Most Convoys do.
I’m asking about protected because that is what i’m going to be using.
Most Convoy lights have long springs on the driver and the tailswitch side, allowing the use of a wide range of batteries. Protected and unprotected.
As Henk says most Convoys will accept protected cells if thats what you have
So seems i have a bit of a problem. Can anyone give me the actual flashlight links for the suggested Convoy options because i’m a bit confused because they seem to be from a lot more price points then i expected and i don’t know which is the correct one.
Which option are you looking for?
The ones suggested here in the upper answers Convoy s2+ and Convoy M1.
Well yeah, but there have been many “suggestions”.
If you will tell me the specefic LED’s you want… I’ll be glad to find them & post the links.
That is the point, i already said. I need the 18650 version, for about 10-15 bucks. From the official store that was given here.
OK, Give me a bit & I’ll post some liks in that price range.
I do not think you can get a M1 for “10-15 bucks”… but we’ll see.
Here is the thing this is my price range, but i’m not stuck to it, i’m willing to maximum of 25-28 bucks per light, but that is about it. I don’t really see much reason for much more pricey versions. And i’m looking for both S2+ and M1.
What colour of light do you want, yellowish like indoor light bulbs (2700K), a more neutral white which is less yellow (3000-4000K), white light like fluorescent tubes (5000K), pure white which is almost trending blue (6500K) or harsh blue white (7000K+)?
There is also lots of in between.
I go for 4000-5000K
The thing is i don’t know what most of these mean. Over the course of the years many things have changed in the Flashlight world so i don’t know what those are as a scale to choose.