What you learned from this test is the power draw for that ballast and bulb together, what you didn't learn was the individual draw of each, if the bulb is rated at 400 watts it may only draw 375 and the balance is the ballast. You would need to do the same test with the electronic ballast and compare the results to know the ballast loses with one versus the other, but there is much more to this. In commercial applications ballast loses are rated at about 12% and these guys know lighting. When you pay the bill for 250 1000 watt metal halide bulbs running 365 days a year in a mega mall parking lot you pay attention to the details.
Read the lumen depretiation curve for the bulb, you'll find it runs about 20% loss over the life of the bulb with a non defined ballast, this is critical. Lets assume it was a magnetic ballast and bulb life is defined by the industry standard, when 50% of them have failed under ideal conditions. On off cycling and mounting orientation effect the lifetime dramatically and lumen losses are right in line with the life cycle.
Considering all this, your test has only shown you what your electric bill will be.
So lets move on to electronic ballasts. Don't install them in a fixture, the heat of the bulb will degrade the components and lead to early failure.
The algorithim in an Accendo electronic ballast will maintain 95% of the initial lumen output over the life of the bulb, that 15% more light for the money, not including the savings that you have yet to determine from your incomplete test, if there are any. It can also restrike much faster giving more light sooner and can double or triple the lifetime of some bulbs, but this changes from bulb to bulb.
I know someone that just bought a 250 watt Accendo, I have a meter and when I get the chance I'll compare the two ballast types with the 250 watt Hortolux and post the results.
Read the lumen depretiation curve for the bulb, you'll find it runs about 20% loss over the life of the bulb with a non defined ballast, this is critical. Lets assume it was a magnetic ballast and bulb life is defined by the industry standard, when 50% of them have failed under ideal conditions. On off cycling and mounting orientation effect the lifetime dramatically and lumen losses are right in line with the life cycle.
Considering all this, your test has only shown you what your electric bill will be.
So lets move on to electronic ballasts. Don't install them in a fixture, the heat of the bulb will degrade the components and lead to early failure.
The algorithim in an Accendo electronic ballast will maintain 95% of the initial lumen output over the life of the bulb, that 15% more light for the money, not including the savings that you have yet to determine from your incomplete test, if there are any. It can also restrike much faster giving more light sooner and can double or triple the lifetime of some bulbs, but this changes from bulb to bulb.
I know someone that just bought a 250 watt Accendo, I have a meter and when I get the chance I'll compare the two ballast types with the 250 watt Hortolux and post the results.