Noticeable like night and day. It's not a ramp down, it's sudden and very noticeable. In my 70 degree F garage, stationary, with no wind cooling it occurred in 5.5 minutes. You can also hear the step down "click".
Jayrob, can you say the step down to 24W after the FF3 has been on a while is noticeable when it happens? I think mine did it last night but it's hard to tell much difference, it must be a gradual decrease. So far at least I've never seen a sudden decrease in brightness. I haven't run it for more than 15 minutes at a time yet but my batteries were quite warm at that point, will try a longer run tonight (if I can stay awake until it gets dark, getting old isn't for sissies)...
Jayrob the bulb you replaced was a 85W ebay with a 'lower' 75W bulb/balast, what value of the ebay HID is overrated the bulb or the balast?
These are some beamshots i took with my HID. It should be 85W/6000K, when warmed up the light doesn't seem really cold and blue compared to your pictures, so i don't know if that is the camera or mine is warmer than yours.
Hi Jayrob, thanks for all the work to put this thread together. A really great job and some wonderful HID's you've got there.
Yeah it looks good in your pictures so it would be impossible to be sure unless the two were side by side...
However I did notice that all of those pictures looked yellowish. So it could be the camera or exposure...
Hi jayrob:
could you PM the name of the ebay seller where you got the 75w/85w 4300K ballast?
Thanks.
OK guys, I did see the step down to 24W on the FF3, along with the audible click at about 13 minutes of walking around in 55-60 degrees. It's still darn bright though, after a minute I couldn't remember how much brighter it had been. It was pretty hot after 30 minutes, I was keeping my hand further back toward the tail for comfort. Also heard the click when it was off and cooling, assuming this was the temp reset.
Jayrob, your magmod looks awesome I've got to resist getting one of those 75W bulb/ballast combos but if I see the right host... (hmmm, FM is having that big sale:laughing
Being the tinkerer and skeptic I am, I wanted to be sure my FF3 was putting out as advertised! First, it is definitely regulated. (Not that I had any question about this but always nice to confirm) As Voltage dropped while in use and fully warmed up, Amperage increased and the calculation always resulted in the same Watts (Input). When Voltage hit 13.00, Amps was 4.02 for a total Input Watts of 52.26. Using the familiar ballast efficiency of 80%, my FF3 is putting out 41.81 Watts to the bulb. Now for the usually disclaimer: Output is AC so to be 100% accurate, I'd need a special $2500+ meter capable of simultaneous, very high count Amp and Volt readings and of determining Power Factor Correction. But for us, it's close enough. Not sure why the Chinese translated FF3 thread was referring to something about a 5 Amp manual setting (by-passing step down)? They see 5 Amps and probably more like 8-9 Amps for a micro-second on start up but will never see 5 Amps when running after warm up. Not even when the cells are nearly empty at 3.0V.
After testing, I took it outside and with a 500-700 foot overcast ceiling, I could easily see a soft glow on the cloud bases.