Eiko brand F15T8 6500k bulb for only $5.70 on ebay...it is very bright (daylight) and cheap....I just got one a few days ago...seems as bright as Zoo-Med or Life-glo aquarium 6500k blubs at 1/4 of the price. It says Halogen but it is a 15 watt fluorescent bulb.
https://www.ebay.com/itm/F15T8-D-Da...429259&hash=item4b5b2d5c5c:g:X9UAAOSwUv1cz9t4
https://www.ebay.com/itm/F15T8-D-Da...429259&hash=item4b5b2d5c5c:g:X9UAAOSwUv1cz9t4
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