Bulb arrived today. Shipped from Hong Kong. The brand is "Aquarmckzo"
This is a 20000k bulb and it will be replacing the Hamilton 14000k bulb that I have been using. I have also been supplementing with 2 URI VHO actinics run by an icecap660 but I switched to the 20000k and removed the Actinics, I hope to use the entie VHO (4 bulbs) lighting system on the propagation system that I am building.
initial observations about the bulb: The construction is very similar to the Hamilton. Seems to have all of the same components in all of the same places, generally. The main electrode attachment bus is slightly different but everything else looks identical. Even the resistor used inside the tube looks to be the same one. The arc chamber is slightly smaller (<1/8")in the Chinese bulb than in the Hamilton. The Chinese bulb is about 1/4" Shorter and is the same diameter as the Hamilton. Although the Chinese bulb is shorter, the arc chamber is located farther from the socket base than in the Hamilton bulb, perhaps 1/2 inch farther. My mounting was already offset a little to that one side, now I feel the need to relocate the bulb to center it over the system. It is now the sole light source over my 36" long 58 gallon tank. One side does look brighter than the other.
My Hamilton bulb went through a color shift as it warmed up, the light emitted during the first 2 or 3 minutes was very very blue and it sort of whitened up as it warmed up and settled into its normal 14000k coloration. The Chinese 20000k takes longer to get warmed up and settle into it's color. This oculd be that it is a new bulb vs the Hamilton being a little over a year old. During the first few minutes of the Chinese bulb warm up it is very very yellow and gradually blues up as it warms up. After settling the flourescent colors do "pop" much more than they did under just the 14000k Hamilton, but that is to be expected based on the color temp of the bulb. I guess what I am saying is that it seems to do what it is supposed to do. What I do like is that he tank doesn't seem to have as much of a blue cast washing everything out as I expected with this switch. It looks very much like the 14000k did but with more "pop"
At this point it has been running for about 30 minutes since the bulb seemed to complete it's warm up. Polyp Extension seems the same as it did with the 14000k Hamilton with two exceptions. The Xenia elongata, which is still pumping, seems to be opened a bit less. Usually between pulses the polyps open up all the way like an open hand, at the moment they are looking sort of like a claw between pulses. Not closed by any means, but less open than before. My GSPs are a little slow to open as well. Other things in the tank are Shrooms, Ricordea, 5 different zoanthids and palythoas, Gree tree coral, Bali Green Slimer Acropora, Orange Montipora digitata, 2 different Frogspwans, a Hammer coral, and a red encrusting Goniopora.
Packaging was good,inside the typical bulb box, then wrapped in bubble wrap and placed inside of some sort of rubber box type thing. It looks like one of those tupperware/rubbermaid savers for a stick of butter except it is about a foot long by 3"x3".
At the moment, the bulb looks good.
I'll post some pics when i can find my camera...
I wish I had a lux meter or some other instrument to actually take some real measurements, but at the moment I have to rely on my own beady little eyes.