HID or metal Halide would be my guess.

but only for the budding cycle of 12 on 12 off, for vegetation you need something with a bit more red spectrum, SON or Sodium is best for the initial 18 on 6 off period....................or so i have heard ;)
 
but only for the budding cycle of 12 on 12 off, for vegetation you need something with a bit more red spectrum, SON or Sodium is best for the initial 18 on 6 off period....................or so i have heard ;)

buy the right lowbay and you can swap the lamps round- free elec the bill won't matter either.
 
buy the right lowbay and you can swap the lamps round- free elec the bill won't matter either.

buy you say???? Many moons ago I used to work for people like CEF, Edmundsons, Newies etc, 9 years in Elecky wholesalers gave me more than easy access to such things, hell I even had some Osram agro lamps as samples from the rep a few times:D
 
buy you say???? Many moons ago I used to work for people like CEF, Edmundsons, Newies etc, 9 years in Elecky wholesalers gave me more than easy access to such things, hell I even had some Osram agro lamps as samples from the rep a few times:D

snigger my mate got asked by plod why he sold a load of gear to a person- his reply was "we are an electrical wholesalers and that's what we do"
 

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