Item Code: 23-57885
Features:
* Excellent colour rendition virtually equivalent to daylight.
* Cool white colour - 6,500K.
* 90 CRI.
* 26,500 initial lumens.
* Produces spectrum very similar to that of natural sunlight.
* Compact tubular bulb and E40 base.
* Excellent power savings due to high efficacy.
* Carbon Resistor construction.
* Probe start style bulb fires on a 400W M59 ballast.
* BUD Model- Operation base up or base down.
FAQ:
Q. I've read lots on web forums that these are really yellow, is that true?
A. In our opinion, this is an accurate visual description given by fellow hobbyists. We think the 400W Iwasaki 6,500K is more "yellow" than the 250W Iwasaki 6,500. But, if you're going for heavy growth in an SPS tank, then this is one of the better bulbs. Supplement it with Actinics, and the light overall can be quite nice. Color, like so much in this hobby, is really a matter of preference and personal opinion and taste.
Q. What are the ANSI codes for Probe Start and Pulse Start ballasts?
A. Probe Start ANSI Codes for Metal Halide lamps: M102=150W, M57=175W, M58=250W, M59=400W, M47=1,000W.
Pulse Start ANSI Codes for Metal Halide lamps: M85=70W HQI, M81=150W HQI, M137=175W, M138=250W, M135=400W.
Q. What is the deal with "pulse start" or "probe start" ballasts?
A. "Probe start" ballasts are more common in the U.S., while "pulse start" ballasts are more common overseas. Most aquarium lighting hoods and pendants sold here in the US have PROBE start ballasts, as most MH lamps sold here are made for those ballasts. However, the short list of PULSE start style lamps commonly sold in the aquarium trade would be: 175W and 400W Ushio 10,000K, and both 250W and 400W Radium 20,000Ks. Those lamps will generally operate fine on pulse start ballasts, and we see little to no problems. We sell both pulse and probe start ballasts so you can get the correct one for your lighting needs.
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