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Since their introduction in the last few months, the XM 15000Kmetal halide lamps have generated a lot of interest. This articlepresents a complete analysis of these lamps. The lamps and ballastsused for the evaluation are presented in Table 1 below. As usualthese lamps were tested using the identical setup to all myprevious tests [1], thus allowing for direct comparison between thelamps.
Table 1: List of XM 15000K lamps and ballasttests reported in this article
| Lamps | Ballasts |
|---|---|
| XM 400W 15000K (Mogul base) | PFO-HQI Taiwan – HQI Standard Magnetic (M59) IceCap (Electronic) Blueline (Electronic) Reef Fanatic (Electronic) EVC (Electronic) Coralvue (Electronic) |
| XM 250W 15000K (Mogul base) | FO-HQI (ANSI -M80) Standard Magnetic (M58) IceCap (Electronic) Blueline (Electronic) Reef Fanatic (Electronic) EVC (Electronic) |
| XM 250W 15000K (Double Ended) | PFO-HQI (ANSI -M80) IceCap (Electronic) Blueline (Electronic) Reef Fanatic (Electronic) EVC (Electronic) |
| XM 175W 15000K (Mogul Base) | Standard Magnetic (M57) Lumen General (Electronic) |
| XM 150W 15000K (Double Ended) | HQI Icecap (Electronic) |
XM 400W 15000K
Table 2: XM 400W 15000K performance on allballasts
| Ballast | Power Watts |
Input Volts |
Input Amps |
PPFD | CCT | Efficiency PPFD/Watt |
|---|---|---|---|---|---|---|
| Magnetic -M59 | 452 | 123.2 | 4.0 | 104.7 | 0 | 0.2316 |
| PFO-HQI | 512 | 121.3 | 5.55 | 114.8 | 0 | 0.2242 |
| Blueline | 383 | 122.2 | 3.27 | 75.4 | 0 | 0.1969 |
| Reef Fanatic | 428 | 122.5 | 3.64 | 83.9 | 0 | 0.1960 |
| EVC | 418 | 121.4 | 3.59 | 85.4 | 0 | 0.2043 |
| Icecap | 416 | 122.9 | 3.5 | 82.2 | 0 | 0.1976 |
| Taiwan – HQI | 457 | 122.2 | 4.01 | 106 | 0 | 0.2319 |
| Coralvue | 453 | 121.2 | 3.87 | 103.8 | 0 | 0.2291 |
Figure 1: Spectral data for XM 400W 15000KLamps on all ballasts
XM 250W 15000K Mogul Base
Table 3: XM 250W 15000K Mogul Base performanceon all ballasts
| Ballast | Power Watts |
Input Volts |
Input Amps |
PPFD | CCT | Efficiency PPFD/Watt |
|---|---|---|---|---|---|---|
| Magnetic (M58) | 295 | 122.8 | 2.82 | 55.7 | 0 | 0.1888 |
| PFO-HQI (M80) | 352 | 124 | 3.18 | 80.2 | 0 | 0.2278 |
| Blueline | 253 | 122.6 | 2.17 | 41.9 | 0 | 0.1656 |
| Reef Fanatic | 256 | 123.1 | 2.2 | 53.2 | 0 | 0.2078 |
| EVC | 272 | 122.4 | 2.33 | 50.6 | 0 | 0.1860 |
| Icecap | 255 | 123.2 | 2.29 | 47.6 | 0 | 0.1867 |
Figure 2: Spectral data for XM 250W 15000KMogul Base Lamps on all ballasts
XM 250W 15000K Double Ended Lamps
Table 4: XM 250W 15000K Double Ended Lampsperformance on all ballasts (unshielded)
| Ballast | Power Watts |
Input Volts |
Input Amps |
PPFD | CCT | Efficiency PPFD/Watt |
|---|---|---|---|---|---|---|
| PFO-HQI | 288 | 122.7 | 2.72 | 56.3 | 15714 | 0.1955 |
| Reef Fanatic | 255 | 123.6 | 2.18 | 61.6 | 39197 | 0.2416 |
| Blueline | 250 | 120.8 | 2.19 | 55.4 | 16126 | 0.2216 |
| Icecap | 242 | 122.8 | 2.28 | 53.3 | 21981 | 0.2202 |
| EVC | 272 | 122.0 | 2.33 | 66.8 | 16404 | 0.2456 |
Figure 3: Spectral data for XM 250W 15000KDouble Ended Lamps on all ballasts (Unshielded)
Table 5: XM 250W 15000K Double Ended LampsPerformance on all ballasts (Shielded)
| Ballast | Power Watts |
Input Volts |
Input Amps |
PPFD | CCT | Efficiency PPFD/Watt |
|---|---|---|---|---|---|---|
| PFO-HQI | 288 | 122.7 | 2.72 | 45.5 | 12898 | 0.1580 |
| Reef Fanatic | 255 | 123.6 | 2.18 | 49.6 | 22625 | 0.1945 |
| Blueline | 250 | 120.8 | 2.19 | 45.4 | 13115 | 0.1816 |
| Icecap | 242 | 122.8 | 2.28 | 43.5 | 16099 | 0.1798 |
| EVC | 272 | 122.0 | 2.33 | 54.9 | 12854 | 0.2018 |
Figure 4: Spectral data for XM 250W 15000KDouble Ended Lamps on all ballasts (Shielded)
XM 175W 15000K Mogul base
Table 6: XM 175W 15000K Mogul base performanceon all ballasts
| Ballast | Power Watts |
Input Volts |
Input Amps |
PPFD | CCT | Efficiency PPFD/Watt |
|---|---|---|---|---|---|---|
| M57 | 198 | 124.4 | 2.06 | 39 | 0 | 0.1970 |
| Lumen General | 181 | 124.4 | 1.63 | 35.8 | 0 | 0.1978 |
Figure 5: Spectral data for XM 175W 15000KMogul base Lamps on all ballasts
XM 150W 15000K Double Ended
Table 7: XM 150W 15000K Double Endedperformance on all ballasts (Unshielded)
| Ballast | Power Watts |
Input Volts |
Input Amps |
PPFD | CCT | Efficiency PPFD/Watt |
|---|---|---|---|---|---|---|
| Icecap | 172 | 123.2 | 1.46 | 33.5 | 14182 | 0.1948 |
| HQI | 181 | 123.2 | 1.62 | 30.9 | 11004 | 0.1707 |
Figure 6: Spectral data for XM 150W 15000KDouble Ended Lamps on all ballasts (UnShielded)
Table 8: XM 150W 15000K Double Endedperformance on all ballasts (Shielded)
| Ballast | Power Watts |
Input Volts |
Input Amps |
PPFD | CCT | Efficiency PPFD/Watt |
|---|---|---|---|---|---|---|
| Icecap | 172 | 123.2 | 1.46 | 26.5 | 14300 | 0.1541 |
| HQI | 181 | 123.2 | 1.62 | 25.18 | 13094 | 0.1391 |
Figure 7: Spectral data for XM 150W 15000KDouble Ended Lamps on all ballasts (Shielded)
Discussion and Summary
A question of interest for most hobbyists is – How do this lampscompare to the XM 20000K lamps.? Table 9 shows a comparison of thePPFD values for the XM 15000K lamps and the XM 20000K lamps. Whatis interesting to note is that several of the lamps – the 250Wmogul ended, 250W DE, and 150W DE lamps had in fact correlatedcolor temperatures around 15000K. For the other lamps the Licorsoftware used with the spectroradiometer was unable to compute thecorrelated color temperature. Spectral plots of all these lamps on”HQI” ballasts (except 175 which is on magnetic ballast) are shownin figure 8. They all have very similar spectral shape, yet thecolor temperature was not computable in all cases (More on ColorTemperature in a future article).
Table 9: Comparison of PPFD with XM 20000Klamps
| Lamp | Ballast | PPFD XM 15K | PPFD XM 20K |
|---|---|---|---|
| 400W Mogul | Magnetic -M59 | 104.7 | 128 |
| PFO-HQI | 114.8 | 98 | |
| Blueline | 75.4 | 91 | |
| Reef Fanatic | 83.9 | 96 | |
| EVC | 85.4 | 94 | |
| Icecap | 82.2 | 99 | |
| Taiwan – HQI | 106 | 114 | |
| Coralvue | 103.8 | na | |
| 250W Mogul | Magnetic (M58) | 55.7 | 73 |
| PFO-HQI (M80) | 80.2 | 79 | |
| Blueline | 41.9 | na | |
| Reef Fanatic | 53.2 | 61 | |
| EVC | 50.6 | na | |
| Icecap | 47.6 | 53 | |
| 250W DE (unshielded) | PFO-HQI | 56.3 | 55 |
| Reef Fanatic | 61.6 | na | |
| Blueline | 55.4 | na | |
| Icecap | 53.3 | 44 | |
| EVC | 66.8 | na | |
| 150W DE (unshielded) | Icecap | 33.5 | 32 |
| HQI | 30.9 | 28 | |
| 175W Mogul | Magnetic (M57) | 39 | na |
| Lumen General | 35.8 | na |
na – data not available
Figure 8: Spectral plots of all XM 15000K lampson “HQI” ballasts
A comparison with the spectral plot of a XM 20000K lamp is shownin figure 9. As seen from the figure, the XM 15000K when comparedto a XM 20000K on the same ballast does have less output in theblue region at 454nm and 420nm, and has higher output from 460 nm-700nm (except for around 550 nm). This would tend to indicate thatthis lamp would appear less blue than a XM 400W 20000K lamp andhence a rating of 15000K.
Figure 9: Spectral comparison of a XM 400W15000K lamp with a XM 20000K lamp
Comparison of the 250W Mogul XM 15000K with its 20000Kcounterpart reveals very similar results to that of the 400W lamp,as seen in figure 10, and similarly for the 250W DE lamps as seenin figure 11.
Figure 10: Spectral comparison of a XM 250W15000K lamp with a XM 20000K lamp
Figure 11: Spectral comparison of a XM 250W DE15000K lamp with a XM 20000K lamp
Acknowledgements
I would like to thank several people whose help made this studypossible. They were kind enough to provide us with lamps andballasts for testing: Jason Ghee from Hellolights.com for supplyingthe lamps used in this study, Patrick at PFO Lighting, Andy atIceCap Inc, Perry at Sunlight Supply, Vince at Ocean Encounters,Champion Lighting, and Reef Fanatics for the ballasts. Finally, Iwould like to thank Dr. Paul Walker of Penn State University forthe use of the spectroradiometer.
References
- www.reeflightinginfo.arvixe.com
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