Fretless
seeker
- Joined
- Mar 9, 2007
- Messages
- 333
- Reaction score
- 114
I am seeing your point now. 250w @ 8" is a lot more footcandles than 600w @ 21". It has been a difficult search finding actual results of people using cool tubes and the like. But the figures I have come across, for instance from a post to Rosenthal, show that you can indeed get closer with air-cooling - but - the distances are not as dramatic as one might hope, and in footcandles, isn't any more energy than a 250w @ 8". In fact the figures Rosenthal gave matched it exactly ~ 18" for 1kw, 12" for 400w (air cooled).
Eventually I did come across some examples of people getting much closer, no doubt using very expensive and powerful exhaust in the reflector, more equipment than most people can afford.
A lot of IR radiation is, in fact, thermal, which accounts for the improved distances, but then a good bit of IR is closer to microwaves and as you say, doesn't care about air movement and fries plants just the same.
So, thanks for the info friend. Re-thinking my layout again, but this is good.
Eventually I did come across some examples of people getting much closer, no doubt using very expensive and powerful exhaust in the reflector, more equipment than most people can afford.
A lot of IR radiation is, in fact, thermal, which accounts for the improved distances, but then a good bit of IR is closer to microwaves and as you say, doesn't care about air movement and fries plants just the same.
So, thanks for the info friend. Re-thinking my layout again, but this is good.