Results from an experiment conducted in my garage. Equipment included Kill-A-Watt P3, Fluke 336, MicroTech DMX, triac-based 4x600W "shoebox" dimmer, SourceFour ERS, Osram HPL 575/115 (UCF) lamp.
Voltage measured at the dimmer input with no load: 121.9
Voltage measured at the dimmer output with no load: 118.3
Voltage measured at the dimmer input with lamp at 100%: 117.8 117.8
Output of dimmer measured as follows:
0% - not measurable
10% - 36.6
20% - 50.7
30% - 69.1
40% - 84.1
50% - 96.9
60% - 106.5
70% - 113.1
80% - 115.6
90% - 116.6
100% - 116.6 116.6
Questions:
1. Why the voltage drop on the input when a load is present?
2. Why such a flat "top end" to the dimming curve?
3. The difference, with a load, between input and output at full, (117.8-116.6) is 1.2. Can this dimmer be considered, {[1-(1.2/117.8)]*100} 99.0% efficient? [Seems unfair to me to penalize the dimmer (121.9-116.6)= ... 95.6% for losses due to the load.]
As always, [user]STEVETERRY[/user], et al, must wait at least one week before replying.
Voltage measured at the dimmer input with no load: 121.9
Voltage measured at the dimmer output with no load: 118.3
Voltage measured at the dimmer input with lamp at 100%: 117.8 117.8
Output of dimmer measured as follows:
0% - not measurable
10% - 36.6
20% - 50.7
30% - 69.1
40% - 84.1
50% - 96.9
60% - 106.5
70% - 113.1
80% - 115.6
90% - 116.6
100% - 116.6 116.6
Questions:
1. Why the voltage drop on the input when a load is present?
2. Why such a flat "top end" to the dimming curve?
3. The difference, with a load, between input and output at full, (117.8-116.6) is 1.2. Can this dimmer be considered, {[1-(1.2/117.8)]*100} 99.0% efficient? [Seems unfair to me to penalize the dimmer (121.9-116.6)= ... 95.6% for losses due to the load.]
As always, [user]STEVETERRY[/user], et al, must wait at least one week before replying.