The Reef Tank banner

1 - 5 of 5 Posts

·
Premium Member
Joined
·
7,654 Posts
The "T" number represents their diameter. Check here for a little more info.


T5's and T12's are the more common ones in reefs. A T5 is a HO (high output) fluorescent, where the T12's can either be VHO (very high ouptut) or NO (normal output).

T8's are also found in reefing, but these are only NO lights.


The larger the diameter, the more phosphorus compounds can be applied, yeilding higher light output per watt of energy used.
 

·
Just some guy, you know?
Joined
·
22,735 Posts
I agree with everything Vince said except the last comment:
The larger the diameter, the more phosphorus compounds can be applied, yielding higher light output per watt of energy used.
It has been proven that the T5 HO bulbs (54 watt) put out far more light (more than triple) what the 40W NO T12 bulbs do (T12 being the larger diameter)

A T8 at 32 W, puts out more than a T12 at 40W (T8 being smaller diameter)

And a HO T5 (54 W one) puts out more light than a 110W VHO (T12) but this last one may be more due to the reflector used, I am not sure how good the VHO internal reflector is.

Whiskey
 

·
Premium Member
Joined
·
7,654 Posts
Yes, NO bulbs are quite inefficient when compared to a VHO, HO, or PC.

Per watt, without a reflector, a large diameter bulb will produce more radiation than a smaller diameter. :)
 
1 - 5 of 5 Posts
Top