How about the indicator coloring paints of yesteryear, or food coloring dyes?
Thanks -- That's a good idea, and one which hadn't crossed my mind.
What sort of application are these being used for?
They're actually linked with the very long-running saga of the mobile home and PV/wind system in this thread
We're putting the regular white CFLs in most of the light fittings (spiral types due to restricted space), but the owner wants a couple of colored bulbs for decorative lighting (alcoves etc.), but being on the inverter system wants to keep the loading as low as possible.
I think he wants a couple of red or orange bulbs for the backlighting in the gas heater too.
[This message has been edited by pauluk (edited 09-02-2006).]