Sure. Use a PWM generator to drive a properly rated FET.

I'm getting a dialog box asking me for a password, I hit cancel but it keeps popping back up to the point where I can't do anything with this spreadsheet because it's now 100% of the time asking me for passwords. Not good! This is how you fix that... Tools - Options - Load/Save - General - Save: Un...

Due to changes made here at LEDGardener, folks can no longer post files other than images. Jump over to GC to download. Click here to download "SPD Simulator v5.1" ... https://forum.grasscity.com/threads/spd-simulator-for-diy-builders.1571898/ SS.png How I digitize Graphs... https://youtu.be/yGD0-UH...

Capt. Saicin wrote: ↑

Wed Aug 07, 2019 12:28 pm

Chiefrunningphist wrote: ↑

Tue Aug 06, 2019 1:48 am

[...]

Yeah, i just used the provided arduino library/code to do the calculations.

On a sidenote: I just bought Osram 660+730nm diodes. If i turn them on the VEML registeres a massive increase in UVA/UVB
I guess it's not THAT usable...

Dam thats not what I was hoping to hear lol

I'm using and Arduino and a VEML6075-Breakout (something like 5$) to measure UVA and UVB. But I have no alternative tool/golden sample/solar simulator to calibrate/verify....and no dedicated UV-lamp, yet. UVB(and UV-Index) under my 50:50 3000k/5000k@200W total (LM301B) is about 1/7th of what i meas...

Hmm.. Does anyone you know have a different UVI meter they could check alongside with the $25? It's funny how it seems to be spot on for outdoors and what the weather stations say but not for the flouro tubes. Maybe test under normal QB light? I'm trying to determine if non UV light will have an eff...

This was interesting... 1561497446661.png 1 has a rectangular reflector running behind it and 1 has nothing that it reflects off of. I'd assume that the un-reflected would be less intense but these results flip that assumption. Has anyone noticed a difference in measurement when the sensor is tilted...

Or_Gro wrote: ↑

Tue Jun 25, 2019 1:35 pm

Chief, my brain’s twisted and i can’t get up...

you, prawn and randomblame need to talk...

Lol well hopefully they'll see it to comment on it. I don't know how to tag ppl yet :/ Im curious what they'd have to say too.

I think that NS1 is close to a 5000k CRI 70 + 660nm + 405nm. NS1... Screenshot_2019-05-07-15-33-50~2.png . What I'm guessing, 5000k CRI70 + 660 + 405... 1561488672369.png . LM301B 5000K CRI70 / NS1 overlay... 1561487392092.png . The big jumbled mess... 1561488921148.png Also... Some more UVI discuss...

I've been looking at this for awhile. I'm not sure what to conclude. It seems to be functioning with consistency, so maybe only a calibration is needed. I wonder how recessed the sensor is?