Hi all,

Something been confusing me about the old HPS vs CFL issue: it seems to be the view that HPS produces more heat for a given grow and therefore you have to have extra ventilation etc. But it is also the view that HPS produces more light per watt than CFL (i.e. you maybe need 50% more CFL watts to get the same result as HPS).

The problem is that this violates the laws of physics. Since neither bulb is converting energy into sound, or into movement, or anything else, there is only heat and light coming out of both of them. So if an HPS bulb produces more light per watt than a CFL, then it would have to achieve this by producing less heat per watt (i.e. converting more electrical energy into light than heat vs the CFL). Or if it produces more heat per watt, it has to produce less light per watt.

So I was wondering which one people think it is: Does HPS produce more light per watt or more heat per watt?
Powernoob Reviewed by Powernoob on . Do CFLs produce more heat/W or more light/W than HPS? Hi all, Something been confusing me about the old HPS vs CFL issue: it seems to be the view that HPS produces more heat for a given grow and therefore you have to have extra ventilation etc. But it is also the view that HPS produces more light per watt than CFL (i.e. you maybe need 50% more CFL watts to get the same result as HPS). The problem is that this violates the laws of physics. Since neither bulb is converting energy into sound, or into movement, or anything else, there is only Rating: 5