Euroquatics E5 Retro Series lamps are the perfect solution for people wanting the power savings, long-life and overall quality of LED, but already have a T5HO fixture.Options (Sizes and Colors) E5 Retro Series lamps come in all the sizes and colors you’re used to seeing with T5HO lamps, making them the perfect drop in replacement when you’re looking to upgrade to power-saving LED without changing out your entire lighting system or the look of your tank that you’ve worked so hard to create! We’re also excited about our latest addition to the E5 line, our Blue Pop lamp. Swap this lamp into your T5HO fixture and get coral pop like you just can’t get with T5HO! This tube is built around the very popular 450-460 nm wavelengths that make your coral come alive! Cost of Ownership So looking at the 8 year cost of ownership, a T5HO lamp will cost you double (or more) of an E5 lamp! And that’s not even counting the time, and hassle of purchasing, changing and trying to recycle your old T5 lamps! Euroquatics E5 lamp will save you time AND money! And that’s something we all can feel good about!