Indoor Information needed..... light fall pattern

[thefunk]

Hello all,

So i just cant find the information i want on the net. I just can't think of the right search term. It must be out there tho....

What i want to know is what angle does the light from a hps lamp go out at. and with various types of reflector.

For example if i have my cool tube 600w hanging, does the lighting pattern below it look like:

a)

oooooo
oooooooo
oooooooooo
oooooooooooo
oooooooooooooo
ooo(cool tube)ooo
oooooooooooooo
oooooooooooo
oooooooooo
oooooooo
oooooo

or b)

oooo
ooooooooooooooooo
oooooooooooooooooooooooooooooooooo
oooooooooooooo(cool tube)oooooooooooooo
ooooooooooooooooooooooooooooooooooo
ooooooooooooooooo
oooo

obviously with the lamp laying in the direction i have written (cool tube)

It might sound unimportant but it's going to influence how i set 2 up properly to get the most even coverage in a 1.2mx1.2m space.


a)
!-----------------------------!




(Cool Tube) (Cool Tube)




!-----------------------------!


or

b)
!--------------------------------!



(Cool Tube)



(Cool Tube)



!--------------------------------!

All help appreciated , thanks!!
​

 

[JM]

 

[thefunk]

Hey JM, thanks for that info. I guess i neglected to mention that all my 'drawings' are looking down from above..... So i'm really interested in the shape that the light is spreading in. So what shape does the hps lamp make on the surface it's hitting. If you look at the diagrams above and imagine you are looking from above then you will see the difference in patterns of light throw under the lamp. Thata what i'm really trying to find out. Obviously if theere is i single point of light then the light fall shape would be round centered dirctly under the light source , but with he shape of a hps lamp and also with the reflectors in play, this must stop it from being a round light "scatter pattern" ?? see what i mean about the language, i have no idea how to correctly explain what i mean. Grrrrrrrr

 

[stonemaster]

What j.m. is trying to tell you is that light varies inverslly proportional to the square of the distance.This means take one distance from the light and if you move it twice as far away you only get 1/4 the light for the same area.Three times as far and it's only 1/9 the light and 4 times gives you 1/16 the light.So get as close to the light as you can without a heat problem. Hope that helps.

 

[Torched]

Different hoods will have different light patterns. In general a 600w will comfortably cover a 3.5 ft x 3.5ft area. Try to position the light in the center of your space. For a more even light distribution try a XXL type or parabolic hood. For more focused and direct lighting try a PL type hood.