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Topic Review (Newest First)
03-18-2013 03:39 PM
mistergreen
Quote:
Originally Posted by Wasserpest View Post
Is there a direct relationship between Lumen and PAR? I am not an expert, but I thought they are two different units, and things like spectrum play a role? Like having two LEDs with the same luminous flow, one with peaks in the yellow/green area, another one more in the red/blue photosynthetically speaking more significant area ?
Yes on all the questions. On Apogee's site there is a lumens to par conversion equation. There is a relationship but it's an approximation for white sun light. A par sensor will have a peak toward the blue.
03-18-2013 03:32 PM
Wasserpest Is there a direct relationship between Lumen and PAR? I am not an expert, but I thought they are two different units, and things like spectrum play a role? Like having two LEDs with the same luminous flow, one with peaks in the yellow/green area, another one more in the red/blue photosynthetically speaking more significant area ?
03-17-2013 11:42 PM
m00se I just tested it in Google Docs and it works. Make a new spreadsheet in GD and then go to File/Import and choose "New Spreadsheet" and point it to the xls file. It will upload it then you'll be good.

HTH

03-17-2013 11:07 PM
Hoppy With a PC I think you do need to have Excel or Office installed to make the spreadsheet work. Without it, it is just a table in a document.
03-17-2013 09:54 PM
skanderson i think it is because i dont have microsoft office installed does that sound right?
03-17-2013 09:52 PM
skanderson that may be the problem. any way to change that? im not a tech person by any stretch of the imagination.
03-16-2013 11:33 PM
m00se Sounds like it's opening the spreadsheet in read only mode.
03-16-2013 09:33 PM
Hoppy Are you using The Excel spreadsheet program? If so, you should be able to enter values the way you would with any other spreadsheet.
03-16-2013 05:49 PM
skanderson that isnt my problem, i have 5 of the variables but i cant get any variables entered into the calculator. any advice on how to put it into the spreadsheet or do i just need to do it by on paper.
03-16-2013 04:58 AM
makutaku
Quote:
Originally Posted by skanderson View Post
im having trouble inputting figures into the spreadsheat. anyone have advice? im planning a led fixture for my new 300 cube build. 48x48x30. thinking of keeping the leds 48 over the substrate and using 30 degree lenses.
The calculator relates six variables. You provide five of them and it calculates the sixth.

You need to answer the following question: what do you want it to calculate ?

Then you need to provide data for all the other five variables. From your statement you already have:
LED height = 48
Cone angle = 30

If you can get the value of three more variables, the calculator will give you the value of the sixth.
03-16-2013 02:16 AM
skanderson im having trouble inputting figures into the spreadsheat. anyone have advice? im planning a led fixture for my new 300 cube build. 48x48x30. thinking of keeping the leds 48 over the substrate and using 30 degree lenses.
03-04-2013 03:32 PM
Hoppy The calculator says about 30 micromols of PAR at 28 inches.

03-04-2013 05:34 AM
dafil 4 inch betwen the rows.3,5 inch center to center in the row.
10x
03-04-2013 05:18 AM
Hoppy How far apart, center to center, are the bulbs? I don't think my empirical equation will be very accurate for this type of setup, but it may be close enough to know if you have very high light or low light.
03-04-2013 03:49 AM
dafil Hoppy,I am asking for your help and opinion-what PAR will get with these 14pcs 3x1w,60deg optics,28inch from substrate,270lm each bulb



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