Well there is light in the garage windows, and the color accuracy is a bit off...so it wouldn't surprise me. With the blue, it can always be dimmed a bit; that pic was at full bright. The purple is a bit dim at full bright...but that's not bad. Apart from getting an accurate "purple" around the edges of the TOD and washing out a bit by the fuel/temp gauges...it's great. The gear indicator/ODO are perfectly lit with the purple.
I'd be willing to swap out for higher wattage purple bulbs...but I'm not sure what LED are going to be brighter AND fit in the stock holes.