Correction on MHs

I wrote:
>In terms of efficacy (lumens per watt), HOs and VHOs are as bad as
>incandescents, which include metal halides.

That's wrong as David Webb kindly pointed out to me. Metal halides are
high-intensity discharge lamps and don't burn filaments to produce heat.
Too many lamps ... too much confusion.

Greg. Tong
San Francisco, CA, USA
gtong at sirius_com

"Every infinity is composed of only two halves."