Bongo Fury

Just got a set of plasma dials & thought I better test them on a battery to check they work before fitting, they illuminate fine but the little transformer box buzzes quite loud but only when its set to blue, when the dials are set to green it still makes a slight noise as would probably expect but nowhere near as loud as when its on blue.
I have emailed visual performance but thought I would ask if anyone on here's is the same while I wait for a reply.

Mine produce a high pitched whine when on blue at brightest setting. The whine is reasonably well masked when the engine is running (V6) unless I listen out for it. As an acoustician I thought it might wind me up but to be fair I haven't really thought about it for a while !

fair enough, just wanted to make sure mines wasn't faulty. Wouldn't have thought it would be very audible over the diesel engine.

We've had the eBay plasma dials for a few years, with no noise when illuminated in any of the colours.

I can't hear mine over the purrrrr of my van