crystal 17.5k

Hi, Planning to sell 2 x 250 watt Geisemann Crystal 17.5K 250 watt halides. These are my backup bulbs and have been ran for 1 month to get over the burning period. I am moving to 400watt of the same bulb and keeping 2 more 250s as backup. Bulbs :- These bulbs are said to last over 2 years...