A question on CMH, IR and Radiant heat.

[thebakedroo]

So I've taken the leap from HPS to 315w CMH, I'm currently running 2 in a well ventilated room with air conditioning, my room temperature (away from any lightning) sits around 23-24c, I've got good air flow on the plants, nothing different to how I've grown with 600w HPS for over a decade, my lamps are in a vertical fixture and about 21 inch from the canopy currently, the room feels cool and my hand above the canopy is cool with nice airflow yet I'm seeing signs of heat stress, if I measure the canopy I'm getting 30-31c while the room is 23c and the plants have good air flow, I can't feel it on the hand and I can get a 600w HPS closer with lower canopy temps in this room.

Sitting here rather confused I looked up the bulb I'm using (Maxpar 3k from nanolux), there's a popular youtube video which tests the spectrums on a group of bulbs including the one I'm using.

What I've noticed is the bulb I'm using has a huge spike around the 800nm range, the highest of all tested while a bulb like the Philips puts out far less in that range vs the maxpar 3k

Is it possible this big spike in the 800nm range is causing higher than normal radiant heat? I'm not sure what to do now other than buy 2 of the Phillips bulbs.

Thanks!

 

[Koondense]

The phillips bulb also has that spike, the curves are over each other.
Seems to have more ir actually because of that spike just before the bigger one which is same as ushio's.
Otherwise the phillips will be an excellent choice.


Cheers

 

[thebakedroo]

The phillips bulb also has that spike, the curves are over each other.
Seems to have more ir actually because of that spike just before the bigger one which is same as ushio's.
Otherwise the phillips will be an excellent choice.


Cheers

Thanks for that, it seems I needed my glasses, I can see now on a closer look the philips spikes around the others, not as much as the maxpar but like you've said, the spike just before hand would leave them close, I'll keep using these till it's time for a new bulb and try a few other things to bring the canopy temp down.

Has any one found the CMH bulbs put out more radiant heat than HPS?

 

[popta]

Can't help with the radiant heat question, but that's an interesting chart. It looks an awful lot like most of those are rebadged versions of the same bulb, which is something I've always suspected. Must be some main asian factory somewhere that cranks them out before they get marketed under different names.