Yes Mitch, there's differences between the two fixtures that can explain the prices differences. People idea on that topic is somehow strong that one system is the copy of the other one but we think it's like puting an apple next to a tomato!
Main difference should be the so called efficiency of the bulbs but as i dont have solid evidence i would have to let Giesemann owners express themselves over that subject. One thing is for sure we seem to be less expensive in particular market when it comes to replacement. As i want to play fair, a test demonstarted that AB DE bulbs have a better PAR than BLV DE bulbs (used by Giesemann) but the question we ask is "for how long?"
If we look at the body of both fixtures, Giesemann features a full extruded aluminium body while AB have an less thicker aluminium main frame finished by two end plate in galvanized steal. This production technique saves money for the manufacturer.
The AB powder coated finish is not a high glossy finish as for the Giesemann fixture. Putting two fixtures next to the other gives you a direct answer when it comes to finition.
Giesemann have some models with an integrated microprocessor and total polished aluminium refelctor (reflection factor 99.9%) which can drive their prices higher but can be valuable for some reefer's.
Giesemann have the 230plus model with both MH and PC illumination. The new aquaspacelight future also have theses characteristics.
One thing both company had to deal with in the past years was poor after-sale services. Parts and services are long to obtain and one of the primary objective of Xenia (Giesemann distributor for North America) is to give the necessary information to the retailer and the customer in a more classic and efficient way (we wont turn back any e-mail requesting information) and provide parts and services in quicker delays.
As you can see, we like to communicate and educate people on lighting requirement but we also have to bring evidence to the reefer's community about this topic to be credible. Some of you guys know a lot more than me the hoby itself and i feel like i have more to learn from you that you may learn from me. This can look like i am actualy licking the part of yout body were the back loose is name
but i am not affraid to say that you and the retailer are the one that can help us the most in making of this hobby a more accesible and enjoyable passion.