Light power hero: which powerset?
Radiation Blast, definitely.
I've used it twice now for light manipulation and it works very well.
A Peacebringer. It won't be multi-colored, but it comes with the light theme included.
Peacebringer, but since you don't like KB, go with Rad blast as it was previously suggested.
Wait for Beam Rifle. It requires a weapon, but it's a very real way to hurl multicolored beams at your foes.
Right now there unfortunately isn't much in the way of beam-hurling available. It's mostly bolts, balls, waves, rings, and clouds.
Energy would really be the best for light-based powers, IMO. Radiation might be a passable set for it, though the nuke and the PBAOE aren't very good for light, I'd say (possibly not the targetted AoE or cone, either). Radiation has my favourite snipe attack, though.
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The laws of in-game physics are inconsistent with light. Maybe light does energy damage, maybe light does psi damage. We're not sure.
Anyway, I checked out the character creator, and Illusion Control, Mind Control, Empathy, Psi Blast/Psionic Assault/Mental Manipulation, Energy Melee/Energy Manipulation/Energy Assault, Rad Blast, Claws, Energy Aura, Invuln, and Willpower seem to have passable light type effects with the right customization.
FWIW my light based hero concept ended up psi blast; rad blast looks just a little off, with its gaseous effects and spinning particles.
Just a quick word of warning: there are few frustratingly bad powersets in the game, but Psi Blast for blasters is one of them. If you roll a Psi blaster, make sure to pick a good secondary (like MM) and spend most of your power picks and slots on it instead.
Perhaps a Fire/Psi or Fire/Energy Dominator, with the Fire powers all colored pure white.
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Great ideas - thanks all!
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I'm going to say Illusion/Kin Controller or Kinetic Melee/(anything but Dark) Scrapper.
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I would go rad/rad and make some powers white... others in red.. others in violet...
Work the spectrum.. High damage in the white... emp in the violet and some debuffs in teh red spectrums...
Take stealth and grand invisibility to add to the light bending powers...
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If you wanted to go melee.. Energy/Energy brutes make great light based characters.
The laws of in-game physics are inconsistent with light. Maybe light does energy damage, maybe light does psi damage. We're not sure.
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Thematically, I agree with the others who have suggested both Peacebringer and Radiation. PBs have the powers that look the most luminous (with good reason), but radiation has more acceptable secondary effects (such as less knockback). Go with whichever feels better to you. If you like the result, it's not a wrong choice.
Throw in my vote for a rad/energy blaster. Fits thematically and it's also a pretty sound combination gameplay wise.
I have a concept for hero that manipulates light (e.g. Dazzler, Jubilee, etc.) and hurls multi colored beams at her foes. Which set do you think I could color to get the right effect? Rad Blast? Mental Blast? Sonic Blast?

Energy is out just because I hate the knockback
Thanks for any ideas.
When you see yourself in a crowded room / do your fingers itch,are you pistol-whipped
Will you step in line or release the glitch / can you fall asleep with a panic switch