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2017?????
What is your point?
HE talks about led replacement in 5-7 years..
Already crunched those numbers w/ current costs..
Just mh bulbs for the above 4 (worst case, could be 3) sets $59 each.. $472.... (250W hamiltons at "20000k" eh)
Assuming no ballasts fail...
Yep cheaper but not orders of magnitudes cheaper and NOT even adding another bulb to make up for not using the t5's.. (another 4X $59 =$236)..
Of course one would need to lower the $2200 fixture cost..
$289 x 3 plus $139 x 3= $1284..
$1284 + $472 = $1756.. vs $3359..
3= 250W MH's vs 4 radions..
LED degradation is speculative ATM..
Mh's shift spectrum almost instantaneously, well lets say monthly...
Quote.. Is one any better than another.................
NO
What is your point?
HE talks about led replacement in 5-7 years..
Already crunched those numbers w/ current costs..
I thought I'd try to amortize the cost of what ended up being recommended and the current "flavor of the day" LED..
Starting w/ the MH t5 hybrid:
$2200 for the fixture.
$800 for bulb replacements w/ a change schedule of 18 months and assuming initial fixture comes w/ a set.
$3000
1070 Electrical watts at the bulbs approx
Not considering heating ect .. just sort of light equivalence.
Current Radion Gen 5
4 units placed sideways for a 72 x 24 area
$3359.96
720 Watts at the diodes..
I consider that about watt equiv..
big assumption is that the Radions are run full..
Probably have about 20% leeway in that assuming delivery is normal..
Just mh bulbs for the above 4 (worst case, could be 3) sets $59 each.. $472.... (250W hamiltons at "20000k" eh)
Assuming no ballasts fail...
Yep cheaper but not orders of magnitudes cheaper and NOT even adding another bulb to make up for not using the t5's.. (another 4X $59 =$236)..
Of course one would need to lower the $2200 fixture cost..
$289 x 3 plus $139 x 3= $1284..
$1284 + $472 = $1756.. vs $3359..
3= 250W MH's vs 4 radions..
LED degradation is speculative ATM..
Mh's shift spectrum almost instantaneously, well lets say monthly...
Conclusion
In this article we presented the results of spectral analysis of used 400-watt metal halide lamps in an effort to provide some indicators of spectral differences that occur over the lamps’ age. We agree that the lack of information about the initial spectral distribution of each lamp limits our ability to make accurate comparisons, but we feel that this data will at least provide some sense of how lamps of different ages look under a spectroradiometer and how the spectral characteristics differ. Clearly as indicated by the data, there are larger (faster) drops in the intensity in the violet and blue end of the spectrum for all the lamps. Hence, lamps with higher CCT tend to have a higher rate of intensity drop. Can this data be used to suggest a replacement policy for the lamps? The answer is not all that simple. Before this question can be adequately answered we need to define at what point does a lamp reach the end of its useful life. Should this useful life be based on (a) an absolute threshold based on the total PPFD in the PAR range independent of the lamp or, (b) a specified amount of reduction in the individual lamp’s PPFD in the PAR range, or (c) a specified amount of PPFD in a given radiation waveband?
Quote.. Is one any better than another.................
NO
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