I was recently told the way Ohio law is written they are illegal. Seems the law was written when lasers were first gaining popularity and it limits any light/laser emitting item. The holographic lights do emit light.
Everyone is using them either way.
Most equipment limit laws make absolutely no sense. When you look at the different factions of hunters, anti-hunting groups, and lack of knowledge of most lawmakers it isn't surprising. For instance in Ohio an encore pistol in a straight walled cartridge with 5" barrel is safer and easier to control than an Encore in the same cartridge with a longer barrel and a stock. Really? The stock makes it harder to control? Apparently in Ohio.
The reality is several disabled people pushed the state to allow pistols in cartridges so they could hunt. The "primitive" groups threw a fit and limited in a way that would only allow the minimum for disabled hunters. ODNR couldn't write that down so they made up some nonsense safety bit they reply with whenever the subject is brought up.
State wildlife divisions are every bit as political as all the other divisions.