Scorpion?
I don't think it was that long. It looked quite shallow.
Maybe it was one of these?
http://www.amazon.co.uk/Lezyne-Zecto-Drive-light-black/dp/B00DWELPU0%3FSubscriptionId%3DAKIAILSHYYTFIVPWUY6Q%26tag%3Dduc08-21%26linkCode%3Dxm2%26camp%3D2025%26creative%3D165953%26creativeASIN%3DB00DWELPU0
Do these have a weird pulse mode?
They do and are available at pretty much most bike shops these days. There is a solid mode although that hurts battery life quite a bit IIRC.
@hippy started
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Scorpion?