Adding extra lights

You can add extra lights to your Ninja 250 to increase your conspicuity (i.e. make yourself more visible to other road users). The alternator and battery on the bike don't really have enough reserve power for extra headlights. You could maybe add one extra 55/60W light, but two wouldn't be a good idea on a stock bike with a stock battery.

There are some pretty bright LED units, but they aren't cheap. You might pay $100-$150 or more for a really bright LED light that will help you see the road at night. On the other hand if you just want to be seen, you can get something for under $20 from eBay. I've been running some lights I bought off eBay (from a seller in China) for a couple of years and they are still going strong. Be warned though that despite some of the eBay lights being described as "fog lights" or "driving lights" most of them (particularly the less expensive ones) are really not going to light up the night in the way your headlight does. However they can attract the attention of approaching traffic and make you more easily seen. The basic rule is that if the lights aren't expensive, they won't be super bright (though just because they are super expensive doesn't guarantee they'll be super bright either!).

To power the lights you'll want a switched source of 12v and the easiest place to get that is to tap into the wiring that goes to the lights that illuminate the gauges. If you remove the front fairing of the 3rd generation (88-07) Ninja 250 you'll see two connector blocks going to the dash panel. One has six wires, the other has 4 wires. You can tap +12v from the red wire with the blue stripe that's in the 6 connector block. The ground connection can be picked up by tapping into the black wire with yellow stripes that's in the 4 connector block. The circuit you are tapping into is the tail light circuit. It powers the tail and brake lights, the license plate light and the lights for the gauges. It's a 10 amp fused circuit and the existing lighting uses 3-4 amps, so you can easily add another 30-40W to it without a problem. Most LED lights are only 1 or 2W at most, though the brighter, more expensive higher power models may be 10W or more.

In most states (maybe even all states?), forward facing lights must be white or amber. Generally blue lights are reserved for the police and red lights can only be used on the rear of the vehicle. The lights must also be constant, i.e. flashing lights are not allowed. Again, flashing lights are reserved for the police, emergency services vehicles and tow trucks.