VapeItNow
Member
I have studied the light distances for these lamps on the web and have not found the same distance recommended twice. The overall range is anywhere from 12" - 18". I don't believe in the hand-under-the-light idea, sorry. I have seen the charts for MH and HPS light distances. The HPS light distance chart attached says a 600w bulb can be safely placed at a distance of 8". The MH chart doesn't show the values for a 600w bulb. I couldn't get it to upload anyway, argh! So what is on to think?
I found these other charts on PAR that are very interesting. The HPS chart shows the bulb at 100% at a distance of about 17.5", and I'm guessing the MH chart is about the same if you imagine there are increment marks at every 200w between 400 and 1000.
My conclusion is that I should try to get my ideal temp at the top of the canopy with the light at a distance of 17.5". Any ideas or comments???? There must be something I'm leaving out. Would this apply to every stage of growth?
![Hps_Distance_Chart.jpg](/data/attachments/1798/1798911-9843ac891204e373e4d1eedae8a4a9e2.jpg)
View attachment 2561673
View attachment 2561673
View attachment 2561673View attachment 2561673
I found these other charts on PAR that are very interesting. The HPS chart shows the bulb at 100% at a distance of about 17.5", and I'm guessing the MH chart is about the same if you imagine there are increment marks at every 200w between 400 and 1000.
My conclusion is that I should try to get my ideal temp at the top of the canopy with the light at a distance of 17.5". Any ideas or comments???? There must be something I'm leaving out. Would this apply to every stage of growth?
![Hps_Distance_Chart.jpg](/data/attachments/1798/1798911-9843ac891204e373e4d1eedae8a4a9e2.jpg)
![HPS-PAR-Graph.gif](/data/attachments/1798/1798912-388cea4721fb60473788ffe236c15966.jpg)
![MH-PAR-Graph.gif](/data/attachments/1798/1798913-d7b07f578a52e3d68bc9e64572902fed.jpg)
View attachment 2561673View attachment 2561673