Raised light height but what about intensity?

andusbeckus

Member
Joined
16 Dec 2016
Messages
148
Location
South Yorkshire
I have the Chihiros A Series light and have always had it set 50%. I have since raised the light and mounted it under a shelf for aesthetic reasons and it is now twice as high above the tank as it was before (about 10 inches) but what should I change the intensity to now 100%?
 

dw1305

Expert
Joined
7 Apr 2008
Messages
10,941
Location
nr Bath
Hi all,
I have since raised the light and mounted it under a shelf for aesthetic reasons and it is now twice as high above the tank as it was before (about 10 inches) but what should I change the intensity to now 100%?
Raise the light intensity, you may have less than 50% of the light intensity that you had before, due to the <"inverse square law">.

cheers Darrel
 

Zeus.

Member
Joined
1 Oct 2016
Messages
3,363
Location
Yorkshire,UK
Trail and error , I would go for 100% ( or 95% if after longer life from LEDs) and just keep a eye out for algae. But with the inverse square law algae should be an issue. Keep on eye on your DC as [CO2] may increase as less light means less CO2 uptake of plants
 

andusbeckus

Member
Joined
16 Dec 2016
Messages
148
Location
South Yorkshire
Trail and error , I would go for 100% ( or 95% if after longer life from LEDs) and just keep a eye out for algae. But with the inverse square law algae should be an issue. Keep on eye on your DC as [CO2] may increase as less light means less CO2 uptake of plants

I actually tried 100% at first as I thought that sounded about right but my rocks were green within 4 days so I put it to 50% for now. Will try upping it slowly over a longer period I think.
 

Oldguy

Member
Joined
27 Aug 2018
Messages
383
Location
Gloucestershire, UK
Chihiros A Series ligh

Had a look on the internet to see what this light looks like. I would assume that it could fall between a linear light source and an infinite flat plane, with a strong bias to the linear.

Point source is inverse square of the distance from source to object.

Linear is inverse distance from source to object.

Infinite flat plate there is no reduction with distance.

Go for linear and play around with intensity, there is no easy maths with this one. Note the above statements assume no interference from the medium between the light source and the object.
 

Similar threads

Top