[Hai-users] Replacing ALC switch with UPB

[Dan Barclay]

Thanks!

 

A couple of follow up questions:

 

In using the 35A00-1, will I be able to (manually) set a minimum dim position after I determine what it should be?  That is, keep the level high enough to stop flickering of the LED but keep the straight curve (oxymoron? <g>).  I’m currently seeing bulbs advertised as working reliably down to 5% dim… maybe they’ll get it right by the time I really care.

 

With regard to “not draw enough current” I see Martin’s comment regarding “at least 50+ watts”.   Does that mean 50 equivalent watts?  Or would it require 50 actual watts (say 250 equivalent watts/3500 lumens)?  Does someone have a clear minimum load?  Most loads I run into are not near the minimum, but some accents are (though they could easily stay incandescent).  Sorry if it’s in the specs and I overlooked it.  I do that sometime, lots of info.

 

Also a technical question, just so I’ll have the right picture of what’s going on.   I have assumed these “dimming curves” are based on RMS voltage, with the actual voltage being a 60Hz wave using a percentage off duty cycle cutoff.  Are they using active rounding of the wave to eliminate RF, or passive filtering?  Not that it actually matters, but the injuneer in me keeps asking those questions.

 

Thanks,

Dan

 

 

From: C. [mailto:cldp at hotmail.com] 
Sent: Monday, May 13, 2013 2:46 PM
To: Dan Barclay
Subject: Re: [Hai-users] Replacing ALC switch with UPB

 

Hello Dan,

 

You can use the 35A00-1 with LED but you must understand something important with LED lights.

 

If you dim BELOW a certain point, LED lights will flicker. Also, if you have low light bulb count on a circuit, meaning your circuit does not draw enough current, the LED might act strangely ie turn on by them self of you won’t be able to turn them completely off. I am not saying it will happend but it might happend.

 

If you are using the CFL/LED dimmer, they have special dimming curve and have a low dimming point limit that you can adjust in upstart. By default, the CFL/LED dimmer won’t be able to dim lower than 10%. Keep that in mind as if you are using standard quartz light bulbs, you won’t be able to get 1-9% levels.

 

You are NOT able to change the low dimming point below 10% in upstart. Regardless of what you will do, you cannot go lower than 10%.

 

Also, the CFL/LED dimmer have a different dimming curve. I had made this drawing to show another person who was about to switch to LED lighting and wanted to automate his lighting with HAI product. It was just to “warn” the person about what to expect when using the CFL dimmers. The CDL dimmer have a minimum level startpoint of 10% and there is a strange step at the end of the dimming curve that look something like this:

 

 

cfl-std

 

Again, if you are using standard dimmer, you might have issues with low levels between 1-10% (or maybe more depending on what type of light bulb you are using) and these dimmer might not be suitable for low wattage circuits. I think you need a minimum of 50W to be safe but I might be mistaken there.

 

Hope this help a little !

 

Claude

 

 

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