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That's a good question, although I tend to think that as ballpark numbers they're still valid. An Iwasaki DL metal halide lamp has low PUR compared to violet/blue LEDs. But the halides can generate radiation (UV-A and infrared) that is useful in photosynthesis but not reported by the Li-Cor quantum meter.So... how accurate is a 20+ year old article's information compared to LED or mixed LED setups of today?
Oh no. I am currently using LEDs on my DT. The issues with LEDs (at least in the context of this discussion) is their programming. In the days of off/on lighting, determination of light dosage was easy with the calculation of DLI. With diurnal lighting modulations, calc of DLI becomes difficult, and can be determined only with PAR data logging, unless you're willing to take PAR measurements manually throughout the photoperiod.Not a fan of LED?
Not enough time to acclimate or nutrient issues.I moved from 1800W of MH comprising 4x150/2x200/2x400W with a variety of lamp manufacturers (12000k - 18000k) to Inwatter then to GHL LEDs ... never achieved anything close to the sps coloration of the MH nor the UPAR intensities ... mostly turned brown or green ! Using a special spectrum program from a GHL reef specialist.