Choices would be ATI aqua blue specials 11 k , UV aquasun's 10k , Giesemann Power chrome aquablue plus 11k , Aqua Science Special 15k. , KZ Coral light 12k .
All bulbs are around the same range for color . I favor the ATI aquablue specials . I would find the best prices on one of the above and go from there . I think Reef Geek doesn't charge the full rate on just two bulbs for shipping . U may just have to get them from ur LFS if shipping is a concern .
I have to order 6 at a pop so I get hit on shipping no matter what . LOL