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Need help to create good 2d fake light


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hi everybody..

could you give me tips to create fake light?

i draw fake light like following image with blendMode..(i don't use shader here because it's slow on mobile).

it will be drawn on maps..

i wanna add good simple animation like intensity of light or  glittering 

i need good formula or function to draw good..




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i set 'sine wave spectrum' first


var value = (Math.sin(this.frequency) + center)/(center+1)/this.amplitude + noise;



if center is 0
this formula range have -1 ~ 1

if center is 1
this formula range have 0 ~ 1

if center is 2
this formula range have 0.3 ~ 1

if center is 3
this formula range have 0.4 ~ 1

and frequency is like velocity; you can control speed

noise is noise 

noise = (Math.random()+Math.random()-1)/10;

it's looks better.. but not perfect..

i will do more.. 


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