<a href=showthread.php?s=&postid=12131086#post12131086 target=_blank>Originally posted</a> by PaulErik
The company lists all of the lamps HQI metal halide lamps. It’s just a general term that is used for many different things and the meaning differs by companies and people. Some companies list lamps as HQI but they are just standard lamps. HQI and metal halide get missed used, misunderstood and sometimes like in this case mean the same thing.
The Helios single-ended lamps are just standard probe start lamps built to North American specs (ANSI M57, ANSI M58 and ANSI M59 standards). A true European/M80/HQI standard single-ended lamp does not have a starting circuit within the lamp (a starting electrode connected to a bi-metal switch and a resistor) because the starting voltage for this standard is too high and is not needed. The Helios lamps are equipped with a starting circuit making them standard probe start metal halide lamps.