wwdpublic/Content.Server/Light/EntitySystems/LightCycleSystem.cs

using Content.Shared;
using Content.Shared.Light.Components;
using Robust.Shared.Random;

namespace Content.Server.Light.EntitySystems;

/// <inheritdoc/>
public sealed class LightCycleSystem : SharedLightCycleSystem
{
    [Dependency] private readonly IRobustRandom _random = default!;

    protected override void OnCycleMapInit(Entity<LightCycleComponent> ent, ref MapInitEvent args)
    {
        base.OnCycleMapInit(ent, ref args);

        if (ent.Comp.InitialOffset)
        {
            ent.Comp.Offset = _random.Next(ent.Comp.Duration);
            Dirty(ent);
        }
    }
}