Reefs.org Forums

[jiml77]

I am getting ready to replace VHO lamps on my tank that I purchased used. URI has a Actinic White lamp that is a combo of 5k white and actinic blue. Do you use them exclusively or mix them with actinics. Previous owner had 2 and 2, but it looks like from the specs that they have both in them and do not need to be mixed.

Thanks,

Jim

[Len]

I'd be interested in an intensity (PAR) analysis on these combined phosphur bulbs. Four actinic-whites (or 50/50's) always seem dimmer then a supposedly comparable 2 true actinic + 2 true daylight combination. If it were me, I'd get the real deal (2 actinics, 2 daylights), and stagger the bulbs.

[bowfront]

Hi, URI's actinic white bulb or so-called 50/50 does best when complimented with an actinic 03 bulb IMO. If you have a 4 bulb VHO setup a good combo would be 2 actinic whites and 2 actinic 03's.