Who is using XM Bulbs?

[Chin_Lee]

According to Sanjay's site,
15 K bulbs:
- on 400W XM 15K SE on PFO HQI ballasts gives a PAR of 114.
- on the 250W XM 15K SE on PFO HQI ballast gives a PAR of 80.

Compared to 20K bulbs:
- on the 400W XM 20K SE, you will get the best PAR of 128 with a probe start Magnatek M59 ballast.
- on the 250W XM 20K SE, you get the best PAR of 79 with a PFO HQI ballast.

Mind you - many of these PAR values are about half of what the 10K bulbs will give with similar ballasts