Merry Christmas! Citizen on sale

doz said:

Just because you lower the TCase does not mean it provides more power. It has a max power rating (with an acceptable tolerance). If you hit 80c+, you begin to lose efficiency and drop output (and longevity).

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are you talking about drivers? im only speaking of longevity. im not sure they really drop efficiency at high temps, though its not recommended (though looking at the graph even 10% off the ridiculously long MTBF is still almost nominal but i digress.)

doz said:

Im assuming if you have a 120h putting out 157w that youd be pulling about 175w at the wall. 158w on a 120h is an increase of 30% over rated power....... To boot, this would not be a guarantee with every driver even if this is happening (which I doubt it is with any of them) so to market them as that is just false advertising and bullshit (just like our blurple epistar friends).

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no offense taken. its not bullshit, its just me testing dozens of 120s with an actual meter, and it matching up pretty closely with meanwells test reports every time (not datasheets which are underrated).

and its fair to call out companies you think are dishonest of bullshitting but you really should have something to back up your claims if youre going to do that. its christmas and im not working i wont be doing any show-and tell for at least a day

in the meantime, heres meanwells data on the 120h. 162W on the DC side. little less with 115V input

doz said:

Im assuming if you have a 120h putting out 157w that youd be pulling about 175w at the wall. 158w on a 120h is an increase of 30% over rated power.......

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Yeah, but it wont do 54.24v @ 2.987A. Those are absolute max ranges for both current and voltage. Run it at 54.24v and the current draw will drop. Run it at 2.987A and the voltage will drop.

thanks i just put in an order for four clu058 light engines

ill be ballasting mine using ohms law for voltage dividers. the ballasting resistor will be an AC capacitor being used as a resistor from the formula. R=1÷(2piFC) i found that i only need a 3.33ohm resistor to ballast two clu058 down to 110v 3a. the capacitance needed for the amount of reactance is 790uF. To handle the large current draw from the chips ill be using a parallel bank of 4ct 200uF 500vac capacitors to make an 800uF 500vac handling cap. this goes in seriea with a bridge rectifier and the lights go on the dc side.

doz said:

Yeah, but it wont do 54.24v @ 2.987A. Those are absolute max ranges for both current and voltage. Run it at 54.24v and the current draw will drop. Run it at 2.987A and the voltage will drop.

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it may top out on voltage (53.5V i believe), but it gets damn close. well over 150W. ill post my measurements, you post yours, ok?

iHearAll said:

ill be ballasting mine using ohms law for voltage dividers. the ballasting resistor will be an AC capacitor being used as a resistor from the formula. R=1÷(2piFC) i found that i only need a 3.33ohm resistor to ballast two clu058 down to 110v 3a. the capacitance needed for the amount of reactance is 790uF. To handle the large current draw from the chips ill be using a parallel bank of 4ct 200uF 500vac capacitors to make an 800uF 500vac handling cap. this goes in seriea with a bridge rectifier and the lights go on the dc side.

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can you draw that circuit out?

CobKits said:

can you draw that circuit out?

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using multiple capacitors to make for the larger required value allows for better current pass and the capacitors will remain cool to the touch.

so (not pictured) i just realized i did a linear formular for impedence which os incorrect since he circuit is somewhat capacitive. after plugging into pythagoreans theorem to find the new ballast reactance i found a lower capacitance (660uF) capacitance be the correct value to achieve 3a. 800uF would be a greater pass of current and id have to look at the datasheet for the clu058 to figure out what voltage divided id be making at that impedence.

that would be a great subject for its own thread, lots to discuss in regard to advantages and disadvantages of such a setup vs the typical setup. im guessing its advantages are cost and efficiency and the expense of adjustability and protection circuits in the typical driver

still feels like christmas over here. sale extended thru midnight PST tonight.