Mercury Vapour lights

>Date: Wed, 13 Nov 1996 02:53:11 -0500
>Subject: Mercury Vapor Lights

<snip> They have a VERY narrow spectrum of emitted
>light. It is a very poor match for chlorophyll's needs.
> The bottom line is, I do not think you would be pleased with MV lamps.  Bad
>color rendition, harsh bluish light.  :-(

If this is the case I find it strange that Dennerle would be selling MV
lights to go along with their planted aquarium set-ups, saying that they
will look great and grow terrific plants. The sell florescents and MV -- no
mention of MH. Are there any German readers of this digest who have used MV
for plant growing?
Anyone have an e-mail address for Dennerle so I can ask them?