Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
Target 1 Level 4 or lower LIGHT monster on the field, except a Token; the ATK of all monsters currently on the field with its name become 2000, until the end of this turn.
--フォトン・ブースター
--Photon Booster
local s,id=GetID()
function s.initial_effect(c)
	--Activate
	local e1=Effect.CreateEffect(c)
	e1:SetCategory(CATEGORY_ATKCHANGE)
	e1:SetType(EFFECT_TYPE_ACTIVATE)
	e1:SetProperty(EFFECT_FLAG_CARD_TARGET)
	e1:SetCode(EVENT_FREE_CHAIN)
	e1:SetTarget(s.target)
	e1:SetOperation(s.activate)
	c:RegisterEffect(e1)
end
function s.filter(c)
	return c:IsFaceup() and not c:IsType(TYPE_TOKEN) and c:IsLevelBelow(4) and c:IsAttribute(ATTRIBUTE_LIGHT)
end
function s.target(e,tp,eg,ep,ev,re,r,rp,chk,chkc)
	if chkc then return chkc:IsLocation(LOCATION_MZONE) and s.filter(chkc) end
	if chk==0 then return Duel.IsExistingTarget(s.filter,tp,LOCATION_MZONE,LOCATION_MZONE,1,nil) end
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_FACEUP)
	local g=Duel.SelectTarget(tp,s.filter,tp,LOCATION_MZONE,LOCATION_MZONE,1,1,nil)
end
function s.afilter(c,code)
	return c:IsFaceup() and c:IsCode(code)
end
function s.activate(e,tp,eg,ep,ev,re,r,rp)
	local tc=Duel.GetFirstTarget()
	if tc:IsFacedown() or not tc:IsRelateToEffect(e) then return end
	local g=Duel.GetMatchingGroup(s.afilter,tp,LOCATION_MZONE,LOCATION_MZONE,nil,tc:GetCode())
	local tc=g:GetFirst()
	for tc in aux.Next(g) do
		local e1=Effect.CreateEffect(e:GetHandler())
		e1:SetType(EFFECT_TYPE_SINGLE)
		e1:SetCode(EFFECT_SET_ATTACK_FINAL)
		e1:SetReset(RESETS_STANDARD_PHASE_END)
		e1:SetValue(2000)
		tc:RegisterEffect(e1)
	end
end