I'll agree with bricktop that HTG offers a great warranty but the largest mistake I ever made was going with HTG for my initial purchase. Everything they sell is outrageously expensive for the quality. They sell 1kW nondimmable lumateks for $360, this place sells dimmable lumateks for $250...
http://www.urbansunshine.com/digital-ballasts
There own alibaba chinese ballasts are even more expensive than the competitors lumateks... Thats NUTS!!!
They guaranteed I wouldn't be able to find a hortilux cheaper than their bundle - week later found out that all 4 local hydro shops sell them for ~30% less...and offers a 1.5 year warranty on all their bulbs.
He he, even alibaba offers a factory 3year warranty -
http://www.alibaba.com/product-gs/368453901/Digital_Ballast.html?s=p
It's like many businesses, they will have a loss leader, something they make squat on to make everything they sell appear inexpensive. Compare the prices and quality and name brands of their 600-watt light systems to HTGS.
This is the only one that is less expensive than the Digital Greenhouse at HTGS.
[h=1]Prowing 600w HPS System[/h]
$267.85 $184.85
Dimensions: 20 in.long x 15 1/2 in. wide x 4 1/4 in. tall. The Prowing refector offers a pebbled aluminum reflective material allows for great coverage and diffusion. The socket mogul, junction box and lamp cord are built in and pre-wired into the reflector. A sturdy galvanized steel spine give the reflecter rigidity. Hanging hardware is included. This unit can not hold glass and is not air coolable.
Comes standard with:
(1)
ProWing Reflector
(1)
600w HPS ProBox Ballast
(1)
600w Ultrasun HPS Bulb
[h=3]Specifications[/h] [h=2]Prowing 600w HPS System[/h] Reflector manufactured by Sol Power Lighting.
Standard Ballast manufactured by Sol Power Lighting
120 volt , 6.0 Amp , 60 Hz, 600 watt
Reflector dimensions: 20 Long x 15½ Wide x 4¼ Tall
Features a built-in-socket and pre-wired 15ft lamp cord