I wouldn't recommend it. Adding a layer of tint to the headlight lens will block some of the output and reduce the effectiveness of the lighting. How much, I don't know.. it probably depends on the quality and color of the film. Keep in mind that a darker yellow reduces output much more than a lighter yellow, which is less likely to affect output, but also makes the lenses look like they've been yellowed by sunlight exposure.
More importantly, what are your local laws regarding tinted headlamps (if there are any)? Yellow lenses/lighting will be very easy for cops to spot, which could make you an easy target for a ticket.
My only experience with yellow tint on lighting is from adding like 3 layers of yellow tint to my fog light lenses. I didn't mind doing this because my fog lights might as well be cosmetic, but I only had the tint on for a year. I found a couple of old pictures and attached them below. You can really see the difference in light intensity, and IMO the yellow is still too "pale" looking even with 3 layers of tint.
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