I did a side-by-side comparison test between a MagLite Magnum Star Xenon flashlight rated for 122.2 lumens with four D-cell alkaline batteries, a Rayovac Roughneck Flex360 LED flashlight rated for 130 lumens with three AA-size alkaline batteries, and a Streamlight Buckmaster LED Tactical flashlight with the new C4 LEDs rated for 180 lumens with two 3V CR123A lithium batteries (camera batteries). In spot focus applications, which is what the vast majority of flashlights are used for, the MagLite Magnum Star Xenon very easily out-threw both LED flashlights in terms of beam intensity. The battle was no contest, the MagLite flashlight remains unmatched. In flood-lamp-type applications, such as when using the flashlight for a guide light, the C4 LED in the Streamlight Buckmaster Tactical Flashlight was by far the winner.
The other big advantage to a four-D-cell maglite flashlight is in an emergency, the flashlight can be used as a baton to aid in self defense. My cousin is a veterinarian and she says if you're riding a bike and a dog starts chasing you, hitting the dog with a shot of pepper spray is only going to make the dog more aggressive. She says in such situations, your best line of defense is something to distract the dog or at least hit it in the nose or jaw to get it to release its grip on you, and a MagLite Flashlight with four D-Cell batteries has enough weight behind it to cause death by blunt-force trauma, and the MagLite casing is so durable it can withstand being run over by a tank.
If you really want to know what flashlights are the best at night, ask the people who have to use flashlights as part of their jobs...Police officers, firefighters, soldiers, electricians...They'll all tell you the same thing: Nothing beats a MagLite.
Edit: The Tiabolo ACE-G flashlight has the best corona and range in its class (tactical flashlights), and so is by far the best choice for bicyclists, but it does not come cheap, with an asking price of just under $105 which gets you a 700-lumen CREE MC-E LED bulb. The Fenix TK11 LED flashlight doesn't even compare to the Tiabolo ACE-G, while the StreamLight Buckmaster C4 LED flashlights will match any flashlight under $100 in beam intensity.
If you don't care about price or battery runtime, then the flashlight that will blow all the others away is the Xtar D30 Howitzer II, which boasts 3 MC-E CREE LEDs and a rated light output of 1700 lumens, truly a Night Sun, but the asking price for that bad boy is $250.
The Rayovac Roughneck Flex360's main advantage is it boasts a clamp, magnet, and directional flashlight head that can pivot 90 degrees and rotate 180 degrees for true hands-free light. It is a utility flashlight first and foremost but is useful for bicyclists because you can use the clamp or magnet to have it anywhere on the bicycle frame and adjust the head to aim the light anywhere you need to. Runtime on High (130 lumens) is 12 hours on 3 AA-size alkaline batteries and its maximum beam range is 450 feet in spot mode, with spot mode boasting a corona the size of a basketball at 450 feet. In Flood mode, the beam's maximum line-of-sight range is 50 feet but the corona is 15 feet in diameter.
Honestly, though, brighter light isn't always better if you're riding in areas with no street lights (my eyes adjust so well for moonless nights in areas with no street lights that I can navigate around without the aid of a flashlight; in fact, I see better at night in situations where the ambient light level is virtually nil). In what I call "perfect darkness", which is as black as night can get, then once my eyes adjust, which they do to the point where I can see white areas clearly, then I only need a 30-lumen LED lamp to be able to see perfectly.