ok, giesemann megachrome coral "preview". its now on its second day firing, for a total of about 8 hours. its sitting on over a 55g that curing rock.
prelim conclusions.
wowsa, this thing is white and bright. actually surprising how white it is considering when i first fired it there was a tinge of green and yellow. there is a good amount of contrast sitting about 3 inches over the tank.
i think there was an error on one of the plot switching the numbers for shielding around on sanjays reef lighting info page.
heres the link to a review article where the giesemann is tested with other bulbs. the megachrome coral unshielded was 126 with the shielded still great at 101:
http://www.advancedaquarist.com/2006/4/review
and which has what i think is the correclty labeled plot:
<img src="http://www.advancedaquarist.com/2006/4/review_album/Figure8-gscoral-de.gif"/>
and heres the aforementioned plot that i think is incorrectly labeled as shielded (source:
http://www.reeflightinginfo.arvixe.com/)
<img src="http://www.reeflightinginfo.arvixe.com/spectraldata-line-1.php?Watts=250&LampManuf=Giesemann&Lamptype=Double+Ended&LampName=140&LampNameText=Giesmann+250W+Coral+13000K+DE+1&BallastName=8&BallastNameText=PFO+250W+HQI+%28M80%29&Shielded=Y+&Minwavelength=400&Maxwavelength=700&Submit=Plot+Data"/>
dont worry about the incorrect 13k label, he already stated somewhere in a post here on rc that it was mis-labled.