Mainstream choices (in my order of preference):
[forget the BD Spot - very poor batt. life, IME - does NOT meet Mfr's stated specs for batt life in my own testing.]
Couple either of the above with a Photon Freedom (as someone else has already suggested). This conserves batteries in the headlamp you'll be using when on the move. Even on low both of the above are too bright, IMHO, for use as a task light, though the TikkaXP does have the diffuser for use as a task/proximity light. Save the Photon for use as a task/proximity light.
If you don't need a lot of throw when on the move, the new (2006 model and newer) Petzl ZipkaPlus is 80% brighter (it really is bright) or the PT Quad might suffice. Neither does for me, since my comfort zone when on leaf covered, indistinct, unfamiliar trails is to be able to see 30' ahead in order to spot low contrast, faded blazes so as not to wander off trail (i do a lot of night hiking - it's a different world out there in the darkness of the forest, and until some people get used to it, the darkness of their imaginations).
Now, if there is snow on the ground, that is a different story. The 4x5mm LED array headlamps would probably do just fine.
There are some other non-mainstream/popular choices out there that might suffice, especially if you are NOT under tree cover and have a moon and clear skies, but even under tree cover you young'uns without age deteriorated low light vision would probably do just fine.
The Streamlight Enduro is a 6/14.5 lumen 0.5W Luxeon using only 2xAAA batts and a boost converter to up the voltage. Mfr. claimed "burn" times which i've more or less verified are 24hrs on low and 6hrs on high. Not sure if Li batts would cause damage, but, IIRC, the headlamp is also regulated, so Li would probably work. There are "no-name" clones of this headlamp. If it turns out that you need high output mode, then you don't get much batt life (6hrs Mfr claimed). I can testify that on LOW output it will run for 19-20hrs; maybe even the Mfr. claimed 24hrs, as i rarely did use HIGH output, so this might account for my slightly less than claimed batt life. LOW output, at 6lumens, does NOT seem that bright to me. I couldn't use LOW to navigate the trails in my neck of the woods. LOW output would be quite sufficient to walk a simple foot path however.
EGear (Essential Gear) makes several interesting headlamps. A 0.3w using a single AA batt (not AAA like the 2x5mm Gerber Tracer - don't waste your money on it; batt life is not quite what it claims; light output is dim; construction is a bit on the cheap side) which lasts quite a long time, called the Mini-Titan. Claim is 33hrs of light, but i've gotten 25hrs of decent light output - not too shabby to say the least. This one has a convex lens (which is easily removable to obtain a nicer "flood" of light) to focus the light into a tiny, somewhat less-than-usable small "spot". This one might be pushing it for on-trail navigation, but it would easily suffice for walking a simple foot path.
Another EGear headlamp is the Auro 0.5W headlamp, using 3xAAA batts. It's brighter than the Streamlight Enduro 0.5W headlamp (Mfr claimed 20lumens vs. 14.5lumens, and in my side-by-side comparison), but it only has HIGH output (and a flashing mode) and so, only runs for a Mfr claimed 9.5hrs on a set of batts (i haven't tested batt life yet on this one).
The Enduro weighs 2.75oz; the Mini-Titan weighs 2.75oz; the Auro weighs 2.8oz.
If it were me though, i'd stick with the TikkaXP+PhotonFreedom combo, or the PT Eos+PhotonFreedom combo.
I don't bother with anything but white lights any longer. Unlike when i was in the military, I don't see the need to preserve low light vision or not be easily seen by others. Rarely do i find that there is sufficient ambient light to make using RED LEDs beneficial by preserving my low light vision.
There are quite a few other choices that i didn't mention, both AAA powered lights and larger AA powered lights which might be heavier than what you want to carry. I prefer the AA powered lights due to their much longer batt life, especially if run on lower output modes, which often suffice.