The Lounge Light Projector might resemble a can of WD-40 more than anything else, but it's actually a lamp affixed to a battery that can keep whatever-you-want lit up for 150 hours. (That's the battery life. The bulb itself lasts a whopping 100,000 hours.)
Plus, to use one of my favorite expressions, it's! But if that annoys you too much, you can push a "color hold" button on the Lounge Light Projector to "freeze" the gadget on a color that you like.
It'd be cool if you could get a plug-in version of these, but for now, it looks like they're battery-only. But that's OK. The light itself only costs $15.95, and a pack of six refill batteries will also cost $15.95. Not bad at all.