Now understand. You never get what you want. With current handware level, monitors cannot make light that bright, and always clip max at some range. That white things is not bug, in reality colors in picture are blue. You can workaround that problem savin picture in float point format (EXR?) and do “tone mapping” trickery as post pro. Some commercial renderers and Luxrender can do that on fly, Cycles not.
If you not believe, little demonstration - open Color management panel settings, and try to change “Exposure” slider as scene rendering. You will get blue light as slider go left, but almost all image go black, as “dymanic range” of that scene is huge and not fit any monitor dynamic range.
P.S. I suggest use compositor, tone map with some “fog glow” will make you picture very “pro” look even with very high light strength, just tweak tonemap paremeters a bit ot seatch examples (keywords “fog glow” and “tone mapping” in compositor related forum)