Everyday it seems I receive an email from a lighting manufacture wanting me to use their fixtures. I use the outdoor lighting fixtures I use due to their being proven to withstand harsh conditions and have proven to be in the field and still working for over 16 years on sites.
Alot of companies who install outdoor lighting are less expensive due to the fact that they only want their check and DO NOT CARE if the lights are working or holding up after their installation warranty period is over.
Some outdoor companies or landscapers will try to sell you on their brass or copper fixtures that perhaps their company cheaply make in house.
Lamp sockets cheaply made that allow play in the lamps are also something we run into alot and replace with new sockets or replace the entire fixtures.
Poorly made wiring connections by improperly trained technicians can also lead up to having wires corrode and stop passing voltage correctly and reduce your light life.
old outdoor lighting wiring that was so corroded it was not allowing proper voltage to pass,due to improper connections 
This was tripping the transformers circuit breakers,a landscaper had actually duct taped over these wires a squirrel had chewed thru.
These pierce point connections cause water to corrode cable by piercing the cable,indoor wire nuts should never be used on outdoor low voltage wiring .
Lite Visions cares about building relationships with our customers and we get alot of word of mouth referrals because of that fact. We have gone in and fixed jobs that were badly installed and either weren’t working or things were falling apart in a shot time of the installation.