Earlier quoted context omitted.
A filter to block out a bit of the excess blue light? This would reduce the effectiveness of the light output though, unless you amped up the output to raise all of the colors and then selectively suppressed the blue to help balance it out. Then this would require extra energy, which defeats the purpose of using LEDs to save energy.
You can just use a different color of LED. Honestly people in Seattle, where these LED lamps were first piloted, have been raising these concerns for at least 4 years. This is the product of some combination of bad design, a lack of user-centered thinking at the utilities, and less than ideal incentives. For example, daylight led's were touted as making it easier to identify cars involved in criminal activity because…
The blue is special -- 473 nanometers -- due to the solid state physics of the semiconductor.
There is indeed an ongoing search for white LED designs that produce less glaring blue without sacrificing overall efficiency, but counterintuitively it's a hard design problem. People also want warmer light in their houses, so the problem is not limited to street lighting.
The safety regulations have a special place in hell for "retinal blue" light. As it turns out every wavelength from UV into the IR has a set of weighting functions for estimating the overall hazard exposure. It's possibly a rare example of a truly science based regulation.