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RE: Metal halide burn in?

Whilst Bill Wichers responded to the actual question on 'burn in' time
with the MH lamps (which I personally cannot comment on), I thought I'd
just add the comment that, in my experience, 6500K is actually quite a
green-ish colour temp anyway. 

Whilst not being MH, I operate both the Osram 'Biolux' 6500K tube (CRI
97), and NEC D/HG 6700K tubes (CRI 86), and both of them seem to cast
quite a green tint compared to the colours either side - 10,000K or the
5400K tubes.


Adam Shaw

	(Original Message)
Date: Thu, 13 Feb 2003 22:06:03 -0500
From: "Michael Webb" <webbdog at bellsouth_net>
Subject: Metal halide burn in?

I recently bought a 6500k super bright made by Hamilton for my 54 gallon
planted tank. It was a replacement for the prev. 6500k super bright that
over a year old I was using. I ordered from Drs. Foster and Smith.
when installed it looked nothing like the prev. bulb. It gave a very
tint to the tank,  furniture, walls, etc. I assumed something was
in the bulb, so I sent it back. I then ordered the same bulb from pet
solutions, Installed it, and again, the very unpleasant green hue to
everything, completely washing out the red in my lotus, myacia etc. The
riccia also seems to have stopped pearling. I called Hamilton
and they said there was a burn in period of 100 hours or so until the
color spectrum was reached. Does this sound right? I am wondering
when I replaced my orig. 5500k with the first 6500k a year ago the light
a very white bright.(also made by Hamilton) from the start. Now however
these new bulbs are giving off the very green hue. Also I noticed these
Hamiltons are much slimmer than the old football shaped 6500k Hamilton.
the bulb truly become whiter in a few days or have they switched to a
bulb that just will give this green cast to everything in the tank?
thanks for any insight
Michael Webb