Thats because orange colour is harder to make than standard Red, Blue, Green... even white.
White is produced by using blue with a phosphour coating.
Red, Green,Blue as we know are primary light colours.. these come easy
Orange is made by manipulating a "yellow" coating. Its colour is not as stable as any of its red partners etc.
The most unstable colour is pink.
This whole concept is funny.... i make neon signage and for years we have strived to make rich deep reds... this comes by using expensive coloured Italian made glass... it is an absolutely beautiful colour though... VERY rich and deep.
The "orange"colour of these displays is just the natural colour of neon gas... it fades out to an orange when inside wide diameter tubing.. such as the displays... the smaller the cubic area to be covered, the more RED the gas appears, but it comes at a cost of higher resistance within the gas due to a higher pressure required at filling... this in turn requires a higher voltage to strike the arc consistently.
For 25 years i have heard... "its a bit orangey... any chance it could be redder?"
Now we have the opposite scenario.
The grass is always greener....er... redder... er orangeyer LOL!!!
