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There’s also the cheap Chinese bulbs (I’ve heard are 50/50, I ran the 10ks and they were okay but didn’t last as long)
Buy online 250 watt Aqualine 20,000 German HQI double ended Metal Halide Bulb. The Aqualine 20,000 lamp has a color temperature of 20,000 Kelvin and a high percentage of the light output is at the blue end of the spectrum. AQUALINE BUSCHKE. .