Features:

* Blue light, stronger visually than an Actinic, but will not cause fluorescing.
* 7 1/8" overall length, 5 5/8" glass tube length.
* GX23 style base (hellolight's ballast kits have GX23 bases on them).
* This bulb has an internal starter that is designed to be operated on simple choke magnetic ballast. Electronic ballasts will not work with this lamp or any 9W or 13W lamps which have internal starters, regardless of manufacture.
* Will NOT fit "Mini-Mite" Osram bulb type sockets.

Dimensions:

* 7 1/8" overall length, 5 5/8" glass tube length.

Whats in the box:

1- 13W 7100K CF Lamp

Availability:

Usually ships same business day

Warranty:

30 day Hellolights warranty

More Info:

*** FAQ:
Q. What's the difference between a "Blue 7,100K" and "Actinic 03" bulb?
A. Excellent question! OK, a little background: The original "Actinic 03" bulb was made by Philips. They were not made for aquarium use, but were adopted once news spread about the beneficial aspects of using this bulb over reef tanks. Nowadays, "Actinic 03" has become the marketing term used to identify "blue" looking bulbs. Many bulbs are passed off as "actinic", when they are just a blue bulb.
So, to answer the question, Blue 7,100K bulbs are visually brighter than HelloLights Actinic bulbs. Blue bulbs will NOT fluoresce your animals as well as our Actinic bulbs. Many others sell "actinic", but they are really selling blue bulbs. The phosphors coating the interior of our Actinic bulbs are specially formulated to produce a narrow spike of concentrated violet/blue light. This is why they appear to be more faint than blue bulbs. If you have tons-o-corals, then we suggest going with Actinic 03. Remember, a visual measurement of a lights utility is a poor one.
Q. Why would I want a Blue bulb vs. an Actinic 03 bulb?
A. Blue bulbs definitely have a good use. If you have a "yellow" looking tank, then get the "Blue 7,100K" bulbs. Since it is visually brighter, they are GREAT at washing out yellow, and causing a tank to look whiter. But, if you want to benefit your corals with a very strong spike in the violet range, then go with Actinic 03.