Wether residential lighting, industrial lighting, city lighting, road lighting, airport lighting... the ROI (Return On Investment) and TCO (Total Cost of Ownership) can be a complex technical and financial puzzle to solve because it involves multi-disciplinary expertises and parameters to be consolidated.
Focussing only on Lm/W (Lumens per Watt) or initial buying price is just part of the equation because you also need to take into account the luminary or reflector efficiency, the CRI (Color rendering Index), CCT (Correlated Color Temperature), the PF (Power Factor), the THD (Total Harmonic Distortion), the PE (Power Efficiency) of the ballast or the driver, the lumens deppreciation (i.e. phosphor aging, over-heating, glue failure), the luminary deppreciation (i.e. corrosion, self-cleaning), the risk of ballast or driver electronic failure after a given number of years in the ROI plan, if the lamp runs 24h/7d or multiple daily switching ON/OFF, cost of maintenance, electronic obsolescence management, financial government incentives on energy savings...
Whatever method or model one uses to compute the ROI and the TCO, as of today the HF ballast or LED driver is the weakest point because if it fails, the ROI becomes a nightmare explaining why 3rd party testing helps secure the TCO.
Of course a vendor might offer an extended warranty for the an induction ballast or LED driver but not covering the cost to actually replace a hard to reach lamp so at the end, the real objective for a good ROI is rather of choosing a technology not prone to an expected failure.
Tantratron 3rd party testing uses advanced test and measurement equipment based on its many decades of military electronics practice in the industry for:
* checking the claims of any vendor on the real efficiency of its lighting power supply wether induction or LED
* using in-house etalon digital LF, HF and RF ballast to check the chemical efficiency of the discharge vessel
* performing an accelerated aging test to finely estimate the warranty claim
SmartCity management involves new generation of lighting power supplies with dimmer function to increase even more the energy savings. As of today, a dimmer ballast involves more technical challenge because efficiency is nonlinear load output dependent. In many cases wether an induction ballast or a LED driver design, one can have higher risk of failure when dimming as opposed to ON-OFF energy savings mode.