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Mercury Vapour lamps are ok.

At 03:48 PM 9/13/98 -0400, Aquatic Plants Digest wrote:
>Date: Sun, 13 Sep 1998 20:14:49 +0800
>From: taburnok at skyinet_net
>hi all again ..i know this has been discussed hundreds of times but 
>SORRY IN ADVANCE .. could someone give me feedback on the use of
>mercury vapour bulbs .. the kind that needs a ballast to operate
>.. these are a lot cheaper the MH sets so i need to know if i could
>use these .. TIA

Conventional wisodm dicates they're no good, don't use them. However
poeple DO use them and they do indeed work just fine. They're quite
blue, so if you're really worried, ge a high pressure sodium lamp
tokickin a bit of red. You can get a cheap HPS "security" light 
from any good hardware store for about $50 for 70 watts (roughly
6000 lumens)

There was a guy in alt.aquaria in the late 80's that used them and
had terriffic success. Other have tried them since then.

Richard J. Sexton
richard at aquaria_net
Bannockburn, Ontario, Canada                       +1 (613) 473 1719